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HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Stanmore, Harrow, United Kingdom Historical Air Quality Analysis

Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!

Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

September Air Quality Analysis

Stanmore, Harrow, United Kingdom

2022
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
22nd Sep 2024
82AQI
Lowest AQI recorded on
18th Sep 2025
15AQI

Same Day Analysis (27th September):
On this day, AQI across the 4 years varied significantly: 2026 ranks 2nd highest AQI at 29 of Good air quality, showing improvement over 2025 on the same day.

Day & Night AQI Trend: 27th Sep - 28th Sep 2026

Stanmore, Harrow, United Kingdom

AQI
Day
Night
.

6 AM27th Sep 2026

7 PM

5 AM28th Sep 2026

Day time
Avg. Highest Time
3PM27th Sep

42AQI

Avg. Lowest Time
5PM27th Sep

21AQI

Night time
Avg. Highest Time
8PM27th Sep

31AQI

Avg. Lowest Time
5AM28th Sep

25AQI

In the last 24 hours,

Stanmore's AQI reached its highest point of 42 at 3 PM during the Day, while the lowest point, 21, was recorded at 5 PM during the Day between 27th Sep and 28th Sep 2026.

Day & Night AQI Trend : Aug - Sep 2026

Stanmore, Harrow, United Kingdom

AugSep
30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th
Day
Night
30th Aug 2026426 AMAQI
30th Aug 2026387 AMAQI
30th Aug 2026318 AMAQI
30th Aug 2026239 AMAQI
30th Aug 20262510 AMAQI
30th Aug 20262911 AMAQI
30th Aug 20262912 PMAQI
30th Aug 2026251 PMAQI
30th Aug 2026272 PMAQI
30th Aug 2026313 PMAQI
30th Aug 2026324 PMAQI
30th Aug 2026255 PMAQI
30th Aug 2026316 PMAQI
30th Aug 2026257 PMAQI
30th Aug 2026258 PMAQI
30th Aug 2026279 PMAQI
30th Aug 20262710 PMAQI
30th Aug 20262911 PMAQI
31st Aug 20263412 AMAQI
31st Aug 2026311 AMAQI
31st Aug 2026332 AMAQI
31st Aug 2026293 AMAQI
31st Aug 2026404 AMAQI
31st Aug 2026255 AMAQI

18°C15/23°C

31st Aug 2026346 AMAQI
31st Aug 2026367 AMAQI
31st Aug 2026258 AMAQI
31st Aug 2026259 AMAQI
31st Aug 20262510 AMAQI
31st Aug 20262511 AMAQI
31st Aug 20262512 PMAQI
31st Aug 2026231 PMAQI
31st Aug 2026172 PMAQI
31st Aug 2026253 PMAQI
31st Aug 2026254 PMAQI
31st Aug 2026255 PMAQI
31st Aug 2026236 PMAQI
31st Aug 2026297 PMAQI
31st Aug 2026298 PMAQI
31st Aug 2026279 PMAQI
31st Aug 20262710 PMAQI
31st Aug 20263111 PMAQI
1st Sep 20262912 AMAQI
1st Sep 2026251 AMAQI
1st Sep 2026292 AMAQI
1st Sep 2026253 AMAQI
1st Sep 2026254 AMAQI
1st Sep 2026235 AMAQI

17°C14/21°C

1st Sep 2026216 AMAQI
1st Sep 2026257 AMAQI
1st Sep 2026278 AMAQI
1st Sep 2026279 AMAQI
1st Sep 20263010 AMAQI
1st Sep 20262711 AMAQI
1st Sep 20262112 PMAQI
1st Sep 2026231 PMAQI
1st Sep 2026252 PMAQI
1st Sep 2026253 PMAQI
1st Sep 2026254 PMAQI
1st Sep 2026215 PMAQI
1st Sep 2026296 PMAQI
1st Sep 2026257 PMAQI
1st Sep 2026298 PMAQI
1st Sep 2026259 PMAQI
1st Sep 20263610 PMAQI
1st Sep 20264611 PMAQI
2nd Sep 20262612 AMAQI
2nd Sep 2026251 AMAQI
2nd Sep 2026292 AMAQI
2nd Sep 2026273 AMAQI
2nd Sep 2026254 AMAQI
2nd Sep 2026215 AMAQI

17°C13/23°C

2nd Sep 2026276 AMAQI
2nd Sep 2026257 AMAQI
2nd Sep 2026278 AMAQI
2nd Sep 2026319 AMAQI
2nd Sep 20262110 AMAQI
2nd Sep 20262511 AMAQI
2nd Sep 20262812 PMAQI
2nd Sep 2026311 PMAQI
2nd Sep 2026272 PMAQI
2nd Sep 2026273 PMAQI
2nd Sep 2026254 PMAQI
2nd Sep 2026295 PMAQI
2nd Sep 2026276 PMAQI
2nd Sep 2026277 PMAQI
2nd Sep 2026258 PMAQI
2nd Sep 2026319 PMAQI
2nd Sep 20262510 PMAQI
2nd Sep 20261411 PMAQI
3rd Sep 20262212 AMAQI
3rd Sep 2026291 AMAQI
3rd Sep 2026382 AMAQI
3rd Sep 2026183 AMAQI
3rd Sep 2026234 AMAQI
3rd Sep 2026195 AMAQI

18°C15/22°C

3rd Sep 2026176 AMAQI
3rd Sep 2026197 AMAQI
3rd Sep 2026258 AMAQI
3rd Sep 2026339 AMAQI
3rd Sep 20263010 AMAQI
3rd Sep 20262511 AMAQI
3rd Sep 20262312 PMAQI
3rd Sep 2026311 PMAQI
3rd Sep 2026292 PMAQI
3rd Sep 2026293 PMAQI
3rd Sep 2026234 PMAQI
3rd Sep 2026275 PMAQI
3rd Sep 2026276 PMAQI
3rd Sep 2026257 PMAQI
3rd Sep 2026298 PMAQI
3rd Sep 2026279 PMAQI
3rd Sep 20262710 PMAQI
3rd Sep 20262511 PMAQI
4th Sep 20262512 AMAQI
4th Sep 2026231 AMAQI
4th Sep 2026122 AMAQI
4th Sep 2026213 AMAQI
4th Sep 2026214 AMAQI
4th Sep 2026165 AMAQI

20°C17/25°C

4th Sep 2026146 AMAQI
4th Sep 2026217 AMAQI
4th Sep 2026308 AMAQI
4th Sep 2026389 AMAQI
4th Sep 20264010 AMAQI
4th Sep 20262111 AMAQI
4th Sep 20262512 PMAQI
4th Sep 2026231 PMAQI
4th Sep 2026212 PMAQI
4th Sep 2026343 PMAQI
4th Sep 2026214 PMAQI
4th Sep 2026475 PMAQI
4th Sep 2026276 PMAQI
4th Sep 2026337 PMAQI
4th Sep 2026298 PMAQI
4th Sep 2026299 PMAQI
4th Sep 20262510 PMAQI
4th Sep 20263011 PMAQI
5th Sep 20262912 AMAQI
5th Sep 2026271 AMAQI
5th Sep 2026292 AMAQI
5th Sep 2026293 AMAQI
5th Sep 2026214 AMAQI
5th Sep 2026255 AMAQI

19°C15/22°C

5th Sep 2026296 AMAQI
5th Sep 2026277 AMAQI
5th Sep 2026318 AMAQI
5th Sep 2026339 AMAQI
5th Sep 20262510 AMAQI
5th Sep 20262511 AMAQI
5th Sep 20262912 PMAQI
5th Sep 2026251 PMAQI
5th Sep 2026252 PMAQI
5th Sep 2026293 PMAQI
5th Sep 2026294 PMAQI
5th Sep 2026345 PMAQI
5th Sep 2026276 PMAQI
5th Sep 2026257 PMAQI
5th Sep 2026298 PMAQI
5th Sep 2026299 PMAQI
5th Sep 20264010 PMAQI
5th Sep 20265211 PMAQI
6th Sep 20264812 AMAQI
6th Sep 2026301 AMAQI
6th Sep 2026362 AMAQI
6th Sep 2026253 AMAQI
6th Sep 2026214 AMAQI
6th Sep 2026215 AMAQI

18°C13/22°C

6th Sep 2026276 AMAQI
6th Sep 2026237 AMAQI
6th Sep 2026238 AMAQI
6th Sep 2026309 AMAQI
6th Sep 20262510 AMAQI
6th Sep 20262511 AMAQI
6th Sep 20262712 PMAQI
6th Sep 2026211 PMAQI
6th Sep 2026212 PMAQI
6th Sep 2026233 PMAQI
6th Sep 2026274 PMAQI
6th Sep 2026405 PMAQI
6th Sep 2026316 PMAQI
6th Sep 2026217 PMAQI
6th Sep 2026238 PMAQI
6th Sep 2026259 PMAQI
6th Sep 20262510 PMAQI
6th Sep 20262711 PMAQI
7th Sep 20262712 AMAQI
7th Sep 2026271 AMAQI
7th Sep 2026272 AMAQI
7th Sep 2026313 AMAQI
7th Sep 2026314 AMAQI
7th Sep 2026215 AMAQI

20°C15/26°C

7th Sep 2026216 AMAQI
7th Sep 2026317 AMAQI
7th Sep 2026258 AMAQI
7th Sep 2026259 AMAQI
7th Sep 20263010 AMAQI
7th Sep 20264011 AMAQI
7th Sep 20263812 PMAQI
7th Sep 2026301 PMAQI
7th Sep 2026332 PMAQI
7th Sep 2026343 PMAQI
7th Sep 2026294 PMAQI
7th Sep 2026295 PMAQI
7th Sep 2026236 PMAQI
7th Sep 2026327 PMAQI
7th Sep 2026238 PMAQI
7th Sep 2026279 PMAQI
7th Sep 20262710 PMAQI
7th Sep 20262911 PMAQI
8th Sep 20262512 AMAQI
8th Sep 2026341 AMAQI
8th Sep 2026252 AMAQI
8th Sep 2026253 AMAQI
8th Sep 2026254 AMAQI
8th Sep 2026255 AMAQI

20°C17/24°C

8th Sep 2026276 AMAQI
8th Sep 2026217 AMAQI
8th Sep 2026318 AMAQI
8th Sep 2026279 AMAQI
8th Sep 20263210 AMAQI
8th Sep 20263111 AMAQI
8th Sep 20262912 PMAQI
8th Sep 2026251 PMAQI
8th Sep 2026232 PMAQI
8th Sep 2026233 PMAQI
8th Sep 2026214 PMAQI
8th Sep 2026215 PMAQI
8th Sep 2026236 PMAQI
8th Sep 2026237 PMAQI
8th Sep 2026218 PMAQI
8th Sep 2026179 PMAQI
8th Sep 20264010 PMAQI
8th Sep 20262711 PMAQI
9th Sep 20262712 AMAQI
9th Sep 2026271 AMAQI
9th Sep 2026292 AMAQI
9th Sep 2026313 AMAQI
9th Sep 2026234 AMAQI
9th Sep 2026255 AMAQI

15°C13/17°C

9th Sep 2026236 AMAQI
9th Sep 2026257 AMAQI
9th Sep 2026258 AMAQI
9th Sep 2026279 AMAQI
9th Sep 20262110 AMAQI
9th Sep 20262311 AMAQI
9th Sep 20262912 PMAQI
9th Sep 2026271 PMAQI
9th Sep 2026292 PMAQI
9th Sep 2026273 PMAQI
9th Sep 2026254 PMAQI
9th Sep 2026255 PMAQI
9th Sep 2026236 PMAQI
9th Sep 2026277 PMAQI
9th Sep 2026328 PMAQI
9th Sep 2026299 PMAQI
9th Sep 20263610 PMAQI
9th Sep 20264911 PMAQI
10th Sep 20265612 AMAQI
10th Sep 2026551 AMAQI
10th Sep 2026462 AMAQI
10th Sep 2026503 AMAQI
10th Sep 2026464 AMAQI
10th Sep 2026385 AMAQI

15°C11/18°C

10th Sep 2026276 AMAQI
10th Sep 2026297 AMAQI
10th Sep 2026428 AMAQI
10th Sep 2026369 AMAQI
10th Sep 20263610 AMAQI
10th Sep 20262311 AMAQI
10th Sep 20262512 PMAQI
10th Sep 2026291 PMAQI
10th Sep 2026252 PMAQI
10th Sep 2026253 PMAQI
10th Sep 2026254 PMAQI
10th Sep 2026255 PMAQI
10th Sep 2026216 PMAQI
10th Sep 2026257 PMAQI
10th Sep 2026278 PMAQI
10th Sep 2026299 PMAQI
10th Sep 20262510 PMAQI
10th Sep 20262511 PMAQI
11th Sep 20262512 AMAQI
11th Sep 2026251 AMAQI
11th Sep 2026382 AMAQI
11th Sep 2026363 AMAQI
11th Sep 2026384 AMAQI
11th Sep 2026175 AMAQI

16°C12/21°C

11th Sep 2026196 AMAQI
11th Sep 2026277 AMAQI
11th Sep 2026278 AMAQI
11th Sep 2026299 AMAQI
11th Sep 20262910 AMAQI
11th Sep 20263411 AMAQI
11th Sep 20263212 PMAQI
11th Sep 2026521 PMAQI
11th Sep 2026252 PMAQI
11th Sep 2026253 PMAQI
11th Sep 2026214 PMAQI
11th Sep 2026295 PMAQI
11th Sep 2026236 PMAQI
11th Sep 2026277 PMAQI
11th Sep 2026298 PMAQI
11th Sep 2026279 PMAQI
11th Sep 20263610 PMAQI
11th Sep 20263211 PMAQI
12th Sep 20262312 AMAQI
12th Sep 2026461 AMAQI
12th Sep 2026382 AMAQI
12th Sep 2026253 AMAQI
12th Sep 2026254 AMAQI
12th Sep 2026275 AMAQI

18°C15/23°C

12th Sep 2026236 AMAQI
12th Sep 2026257 AMAQI
12th Sep 2026258 AMAQI
12th Sep 2026299 AMAQI
12th Sep 20262510 AMAQI
12th Sep 20264611 AMAQI
12th Sep 20263212 PMAQI
12th Sep 2026361 PMAQI
12th Sep 2026322 PMAQI
12th Sep 2026253 PMAQI
12th Sep 2026234 PMAQI
12th Sep 2026275 PMAQI
12th Sep 2026336 PMAQI
12th Sep 2026347 PMAQI
12th Sep 2026318 PMAQI
12th Sep 20262910 PMAQI
12th Sep 20262911 PMAQI
13th Sep 20262512 AMAQI
13th Sep 2026291 AMAQI
13th Sep 2026272 AMAQI
13th Sep 2026293 AMAQI
13th Sep 2026244 AMAQI
13th Sep 2026235 AMAQI

19°C14/23°C

13th Sep 2026386 AMAQI
13th Sep 2026177 AMAQI
13th Sep 2026238 AMAQI
13th Sep 2026219 AMAQI
13th Sep 20261710 AMAQI
13th Sep 20262311 AMAQI
13th Sep 20262512 PMAQI
13th Sep 2026271 PMAQI
13th Sep 2026212 PMAQI
13th Sep 2026183 PMAQI
13th Sep 2026164 PMAQI
13th Sep 2026125 PMAQI
13th Sep 2026256 PMAQI
13th Sep 2026257 PMAQI
13th Sep 2026148 PMAQI
13th Sep 2026329 PMAQI
13th Sep 20263610 PMAQI
13th Sep 20261411 PMAQI
14th Sep 20261912 AMAQI
14th Sep 2026211 AMAQI
14th Sep 2026252 AMAQI
14th Sep 2026213 AMAQI
14th Sep 2026124 AMAQI
14th Sep 2026165 AMAQI

19°C17/21°C

14th Sep 2026276 AMAQI
14th Sep 2026277 AMAQI
14th Sep 2026318 AMAQI
14th Sep 2026279 AMAQI
14th Sep 20262510 AMAQI
14th Sep 20262511 AMAQI
14th Sep 20263112 PMAQI
14th Sep 2026291 PMAQI
14th Sep 2026332 PMAQI
14th Sep 2026313 PMAQI
14th Sep 2026294 PMAQI
14th Sep 2026315 PMAQI
14th Sep 2026306 PMAQI
14th Sep 2026307 PMAQI
14th Sep 2026218 PMAQI
14th Sep 2026259 PMAQI
14th Sep 20262910 PMAQI
14th Sep 20262911 PMAQI
15th Sep 20262512 AMAQI
15th Sep 2026251 AMAQI
15th Sep 2026182 AMAQI
15th Sep 2026103 AMAQI
15th Sep 2026204 AMAQI
15th Sep 2026255 AMAQI

20°C17/24°C

15th Sep 2026236 AMAQI
15th Sep 2026187 AMAQI
15th Sep 2026168 AMAQI
15th Sep 2026219 AMAQI
15th Sep 20262910 AMAQI
15th Sep 20263011 AMAQI
15th Sep 20263012 PMAQI
15th Sep 2026251 PMAQI
15th Sep 2026402 PMAQI
15th Sep 2026343 PMAQI
15th Sep 2026364 PMAQI
15th Sep 2026345 PMAQI
15th Sep 2026336 PMAQI
15th Sep 2026347 PMAQI
15th Sep 2026238 PMAQI
15th Sep 2026279 PMAQI
15th Sep 20262710 PMAQI
15th Sep 20262111 PMAQI
16th Sep 20262312 AMAQI
16th Sep 2026271 AMAQI
16th Sep 2026272 AMAQI
16th Sep 2026273 AMAQI
16th Sep 2026234 AMAQI
16th Sep 2026305 AMAQI

19°C15/23°C

16th Sep 2026236 AMAQI
16th Sep 2026367 AMAQI
16th Sep 2026298 AMAQI
16th Sep 2026369 AMAQI
16th Sep 20262510 AMAQI
16th Sep 20262711 AMAQI
16th Sep 20262712 PMAQI
16th Sep 2026231 PMAQI
16th Sep 2026252 PMAQI
16th Sep 2026233 PMAQI
16th Sep 2026244 PMAQI
16th Sep 2026295 PMAQI
16th Sep 2026336 PMAQI
16th Sep 2026257 PMAQI
16th Sep 2026218 PMAQI
16th Sep 2026299 PMAQI
16th Sep 20262110 PMAQI
16th Sep 20263111 PMAQI
17th Sep 20262912 AMAQI
17th Sep 2026271 AMAQI
17th Sep 2026292 AMAQI
17th Sep 2026273 AMAQI
17th Sep 2026214 AMAQI
17th Sep 2026235 AMAQI

15°C12/18°C

17th Sep 2026216 AMAQI
17th Sep 2026237 AMAQI
17th Sep 2026218 AMAQI
17th Sep 2026239 AMAQI
17th Sep 20263410 AMAQI
17th Sep 20264611 AMAQI
17th Sep 20263412 PMAQI
17th Sep 2026211 PMAQI
17th Sep 2026212 PMAQI
17th Sep 2026193 PMAQI
17th Sep 2026234 PMAQI
17th Sep 2026215 PMAQI
17th Sep 2026276 PMAQI
17th Sep 2026277 PMAQI
17th Sep 2026278 PMAQI
17th Sep 2026239 PMAQI
17th Sep 20262710 PMAQI
17th Sep 20263111 PMAQI
18th Sep 20262912 AMAQI
18th Sep 2026291 AMAQI
18th Sep 2026252 AMAQI
18th Sep 2026253 AMAQI
18th Sep 2026254 AMAQI
18th Sep 2026235 AMAQI

16°C13/20°C

18th Sep 2026276 AMAQI
18th Sep 2026257 AMAQI
18th Sep 2026318 AMAQI
18th Sep 2026319 AMAQI
18th Sep 20263610 AMAQI
18th Sep 20264211 AMAQI
18th Sep 20263212 PMAQI
18th Sep 2026231 PMAQI
18th Sep 2026252 PMAQI
18th Sep 2026343 PMAQI
18th Sep 2026444 PMAQI
18th Sep 2026365 PMAQI
18th Sep 2026296 PMAQI
18th Sep 2026347 PMAQI
18th Sep 2026428 PMAQI
18th Sep 2026499 PMAQI
18th Sep 20264610 PMAQI
18th Sep 20264611 PMAQI
19th Sep 20264612 AMAQI
19th Sep 2026381 AMAQI
19th Sep 2026272 AMAQI
19th Sep 2026363 AMAQI
19th Sep 2026364 AMAQI
19th Sep 2026255 AMAQI

15°C11/21°C

19th Sep 2026236 AMAQI
19th Sep 2026257 AMAQI
19th Sep 2026238 AMAQI
19th Sep 2026239 AMAQI
19th Sep 20262510 AMAQI
19th Sep 20262511 AMAQI
19th Sep 20262912 PMAQI
19th Sep 2026271 PMAQI
19th Sep 2026272 PMAQI
19th Sep 2026253 PMAQI
19th Sep 2026294 PMAQI
19th Sep 2026275 PMAQI
19th Sep 2026276 PMAQI
19th Sep 2026257 PMAQI
19th Sep 2026278 PMAQI
19th Sep 2026319 PMAQI
19th Sep 20263410 PMAQI
19th Sep 20262311 PMAQI
20th Sep 20262312 AMAQI
20th Sep 2026121 AMAQI
20th Sep 2026122 AMAQI
20th Sep 2026173 AMAQI
20th Sep 2026194 AMAQI
20th Sep 2026175 AMAQI

18°C15/21°C

20th Sep 2026216 AMAQI
20th Sep 2026197 AMAQI
20th Sep 2026258 AMAQI
20th Sep 2026239 AMAQI
20th Sep 20262710 AMAQI
20th Sep 20262711 AMAQI
20th Sep 20262112 PMAQI
20th Sep 2026231 PMAQI
20th Sep 2026232 PMAQI
20th Sep 2026273 PMAQI
20th Sep 2026294 PMAQI
20th Sep 2026345 PMAQI
20th Sep 2026276 PMAQI
20th Sep 2026257 PMAQI
20th Sep 2026258 PMAQI
20th Sep 2026299 PMAQI
20th Sep 20263610 PMAQI
20th Sep 20263611 PMAQI
21st Sep 20264612 AMAQI
21st Sep 2026421 AMAQI
21st Sep 2026552 AMAQI
21st Sep 2026583 AMAQI
21st Sep 2026754 AMAQI
21st Sep 2026725 AMAQI

17°C14/20°C

21st Sep 2026676 AMAQI
21st Sep 2026697 AMAQI
21st Sep 2026508 AMAQI
21st Sep 2026319 AMAQI
21st Sep 20264210 AMAQI
21st Sep 20265311 AMAQI
21st Sep 20264712 PMAQI
21st Sep 2026411 PMAQI
21st Sep 2026282 PMAQI
21st Sep 2026263 PMAQI
21st Sep 2026274 PMAQI
21st Sep 2026265 PMAQI
21st Sep 2026256 PMAQI
21st Sep 2026387 PMAQI
21st Sep 2026298 PMAQI
21st Sep 2026279 PMAQI
21st Sep 20265710 PMAQI
21st Sep 20265811 PMAQI
22nd Sep 20266012 AMAQI
22nd Sep 2026621 AMAQI
22nd Sep 2026592 AMAQI
22nd Sep 2026643 AMAQI
22nd Sep 2026684 AMAQI
22nd Sep 2026605 AMAQI

17°C13/22°C

22nd Sep 2026546 AMAQI
22nd Sep 2026527 AMAQI
22nd Sep 2026558 AMAQI
22nd Sep 2026739 AMAQI
22nd Sep 20266310 AMAQI
22nd Sep 20265811 AMAQI
22nd Sep 20266412 PMAQI
22nd Sep 2026581 PMAQI
22nd Sep 2026572 PMAQI
22nd Sep 2026283 PMAQI
22nd Sep 2026264 PMAQI
22nd Sep 2026335 PMAQI
22nd Sep 2026256 PMAQI
22nd Sep 2026257 PMAQI
22nd Sep 2026368 PMAQI
22nd Sep 2026449 PMAQI
22nd Sep 20264910 PMAQI
22nd Sep 20264711 PMAQI
23rd Sep 20264212 AMAQI
23rd Sep 2026421 AMAQI
23rd Sep 2026402 AMAQI
23rd Sep 2026363 AMAQI
23rd Sep 2026274 AMAQI
23rd Sep 2026295 AMAQI

20°C17/24°C

23rd Sep 2026316 AMAQI
23rd Sep 2026277 AMAQI
23rd Sep 2026408 AMAQI
23rd Sep 2026509 AMAQI
23rd Sep 20265310 AMAQI
23rd Sep 20265511 AMAQI
23rd Sep 20265312 PMAQI
23rd Sep 2026461 PMAQI
23rd Sep 2026362 PMAQI
23rd Sep 2026273 PMAQI
23rd Sep 2026234 PMAQI
23rd Sep 2026215 PMAQI
23rd Sep 2026256 PMAQI
23rd Sep 2026277 PMAQI
23rd Sep 2026238 PMAQI
23rd Sep 2026299 PMAQI
23rd Sep 20263110 PMAQI
23rd Sep 20263111 PMAQI
24th Sep 20262912 AMAQI
24th Sep 2026271 AMAQI
24th Sep 2026252 AMAQI
24th Sep 2026233 AMAQI
24th Sep 2026214 AMAQI
24th Sep 2026235 AMAQI

19°C15/23°C

24th Sep 2026216 AMAQI
24th Sep 2026257 AMAQI
24th Sep 2026278 AMAQI
24th Sep 2026309 AMAQI
24th Sep 20263210 AMAQI
24th Sep 20262111 AMAQI
24th Sep 20262512 PMAQI
24th Sep 2026221 PMAQI
24th Sep 2026222 PMAQI
24th Sep 2026213 PMAQI
24th Sep 2026274 PMAQI
24th Sep 2026295 PMAQI
24th Sep 2026316 PMAQI
24th Sep 2026287 PMAQI
24th Sep 2026318 PMAQI
24th Sep 2026319 PMAQI
24th Sep 20263410 PMAQI
24th Sep 20264011 PMAQI
25th Sep 20263412 AMAQI
25th Sep 2026251 AMAQI
25th Sep 2026262 AMAQI
25th Sep 2026293 AMAQI
25th Sep 2026254 AMAQI
25th Sep 2026295 AMAQI

17°C14/22°C

25th Sep 2026256 AMAQI
25th Sep 2026297 AMAQI
25th Sep 2026298 AMAQI
25th Sep 2026339 AMAQI
25th Sep 20263310 AMAQI
25th Sep 20263611 AMAQI
25th Sep 20264012 PMAQI
25th Sep 2026421 PMAQI
25th Sep 2026462 PMAQI
25th Sep 2026453 PMAQI
25th Sep 2026404 PMAQI
25th Sep 2026405 PMAQI
25th Sep 2026366 PMAQI
25th Sep 2026347 PMAQI
25th Sep 2026278 PMAQI
25th Sep 2026219 PMAQI
25th Sep 20262110 PMAQI
25th Sep 20262111 PMAQI
26th Sep 20262512 AMAQI
26th Sep 2026271 AMAQI
26th Sep 2026232 AMAQI
26th Sep 2026303 AMAQI
26th Sep 2026314 AMAQI
26th Sep 2026275 AMAQI

18°C14/23°C

26th Sep 2026256 AMAQI
26th Sep 2026277 AMAQI
26th Sep 2026318 AMAQI
26th Sep 2026279 AMAQI
26th Sep 20262310 AMAQI
26th Sep 20262311 AMAQI
26th Sep 20262312 PMAQI
26th Sep 2026251 PMAQI
26th Sep 2026252 PMAQI
26th Sep 2026253 PMAQI
26th Sep 2026254 PMAQI
26th Sep 2026255 PMAQI
26th Sep 2026256 PMAQI
26th Sep 2026317 PMAQI
26th Sep 2026258 PMAQI
26th Sep 2026389 PMAQI
26th Sep 20264510 PMAQI
26th Sep 20264811 PMAQI
27th Sep 20263812 AMAQI
27th Sep 2026401 AMAQI
27th Sep 2026312 AMAQI
27th Sep 2026273 AMAQI
27th Sep 2026254 AMAQI
27th Sep 2026315 AMAQI

17°C14/20°C

27th Sep 2026296 AMAQI
27th Sep 2026297 AMAQI
27th Sep 2026318 AMAQI
27th Sep 2026279 AMAQI
27th Sep 20262510 AMAQI
27th Sep 20262511 AMAQI
27th Sep 20263112 PMAQI
27th Sep 2026231 PMAQI
27th Sep 2026212 PMAQI
27th Sep 2026423 PMAQI
27th Sep 2026214 PMAQI
27th Sep 2026215 PMAQI
27th Sep 2026366 PMAQI
27th Sep 2026297 PMAQI
27th Sep 2026318 PMAQI
27th Sep 2026259 PMAQI
27th Sep 20262710 PMAQI
27th Sep 20262711 PMAQI
28th Sep 20262512 AMAQI
28th Sep 2026271 AMAQI
28th Sep 2026272 AMAQI
28th Sep 2026273 AMAQI
28th Sep 2026274 AMAQI
28th Sep 2026255 AMAQI

17°C14/21°C

28th Sep 2026276 AMAQI
6 AM
28th Sep 2026257 AMAQI
28th Sep 2026258 AMAQI
28th Sep 2026259 AMAQI
28th Sep 20262510 AMAQI
28th Sep 20262511 AMAQI
28th Sep 20262912 PMAQI
12 PM
28th Sep 2026291 PMAQI
28th Sep 2026292 PMAQI
28th Sep 2026403 PMAQI
28th Sep 2026294 PMAQI
28th Sep 2026295 PMAQI
28th Sep 2026366 PMAQI
28th Sep 2026317 PMAQI
7 PM
28th Sep 2026218 PMAQI
28th Sep 2026299 PMAQI
28th Sep 20262310 PMAQI
28th Sep 20262511 PMAQI
12 AM
5 AM

16°C13/19°C

Day time
Avg. Highest Time
11 AM - 12 PM

31AQI

2 hours / Day
60 hours / Month
Avg. Lowest Time
4 PM

27AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 AM to 12 PM (Avg. 31), while the lowest AQI was between 4 PM to 4 PM (Avg. 27).
Night time
Avg. Highest Time
12 AM - 1 AM

32AQI

2 hours / Day
60 hours / Month
Avg. Lowest Time
5 AM - 8 PM

27AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 1 AM (Avg. 32), while the lowest AQI was between 5 AM to 8 PM (Avg. 27).

2026 Days Vs Air Quality

Stanmore, Harrow, United Kingdom

2026

89%

237

11%

30

Total number of days with different AQI categories in last 271 days in 2026 (94 days remaining)

Good
237 Days
Moderate
30 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 89%

Health Risk Level:

Low

In 2026, 89% of 271 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.

Annual Air Quality Insights

Stanmore, Harrow, United Kingdom

AQI levels in 2026

AQI (US)
PM₂.₅
PM₁₀
CO
SO₂
NO₂
O₃
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
44AQI (US)
2nd January 2026
25AQI (US)
3rd January 2026
27AQI (US)
4th January 2026
38AQI (US)
5th January 2026
45AQI (US)
6th January 2026
54AQI (US)
7th January 2026
23AQI (US)
8th January 2026
44AQI (US)
9th January 2026
23AQI (US)
10th January 2026
28AQI (US)
11th January 2026
48AQI (US)
12th January 2026
18AQI (US)
13th January 2026
15AQI (US)
14th January 2026
28AQI (US)
15th January 2026
17AQI (US)
16th January 2026
28AQI (US)
17th January 2026
35AQI (US)
18th January 2026
76AQI (US)
19th January 2026
64AQI (US)
20th January 2026
28AQI (US)
21st January 2026
15AQI (US)
22nd January 2026
36AQI (US)
23rd January 2026
55AQI (US)
24th January 2026
52AQI (US)
25th January 2026
54AQI (US)
26th January 2026
87AQI (US)
27th January 2026
41AQI (US)
28th January 2026
31AQI (US)
29th January 2026
52AQI (US)
30th January 2026
54AQI (US)
31st January 2026
40AQI (US)
1st February 2026
46AQI (US)
2nd February 2026
53AQI (US)
3rd February 2026
63AQI (US)
4th February 2026
38AQI (US)
5th February 2026
54AQI (US)
6th February 2026
55AQI (US)
7th February 2026
39AQI (US)
8th February 2026
42AQI (US)
9th February 2026
47AQI (US)
10th February 2026
46AQI (US)
11th February 2026
43AQI (US)
12th February 2026
38AQI (US)
13th February 2026
47AQI (US)
14th February 2026
44AQI (US)
15th February 2026
38AQI (US)
16th February 2026
39AQI (US)
17th February 2026
47AQI (US)
18th February 2026
46AQI (US)
19th February 2026
48AQI (US)
20th February 2026
44AQI (US)
21st February 2026
37AQI (US)
22nd February 2026
32AQI (US)
23rd February 2026
37AQI (US)
24th February 2026
37AQI (US)
25th February 2026
39AQI (US)
26th February 2026
32AQI (US)
27th February 2026
35AQI (US)
28th February 2026
33AQI (US)
1st March 2026
36AQI (US)
2nd March 2026
49AQI (US)
3rd March 2026
52AQI (US)
4th March 2026
57AQI (US)
5th March 2026
68AQI (US)
6th March 2026
61AQI (US)
7th March 2026
29AQI (US)
8th March 2026
69AQI (US)
9th March 2026
95AQI (US)
10th March 2026
40AQI (US)
11th March 2026
24AQI (US)
12th March 2026
39AQI (US)
13th March 2026
38AQI (US)
14th March 2026
36AQI (US)
15th March 2026
26AQI (US)
16th March 2026
21AQI (US)
17th March 2026
34AQI (US)
18th March 2026
32AQI (US)
19th March 2026
37AQI (US)
20th March 2026
55AQI (US)
21st March 2026
26AQI (US)
22nd March 2026
37AQI (US)
23rd March 2026
60AQI (US)
24th March 2026
49AQI (US)
25th March 2026
17AQI (US)
26th March 2026
20AQI (US)
27th March 2026
26AQI (US)
28th March 2026
33AQI (US)
29th March 2026
26AQI (US)
30th March 2026
23AQI (US)
31st March 2026
27AQI (US)
1st April 2026
28AQI (US)
2nd April 2026
26AQI (US)
3rd April 2026
27AQI (US)
4th April 2026
26AQI (US)
5th April 2026
29AQI (US)
6th April 2026
27AQI (US)
7th April 2026
30AQI (US)
8th April 2026
46AQI (US)
9th April 2026
35AQI (US)
10th April 2026
21AQI (US)
11th April 2026
30AQI (US)
12th April 2026
31AQI (US)
13th April 2026
30AQI (US)
14th April 2026
28AQI (US)
15th April 2026
31AQI (US)
16th April 2026
34AQI (US)
17th April 2026
18th April 2026
26AQI (US)
19th April 2026
26AQI (US)
20th April 2026
26AQI (US)
21st April 2026
23AQI (US)
22nd April 2026
23rd April 2026
22AQI (US)
24th April 2026
22AQI (US)
25th April 2026
44AQI (US)
26th April 2026
50AQI (US)
27th April 2026
49AQI (US)
28th April 2026
33AQI (US)
29th April 2026
21AQI (US)
30th April 2026
24AQI (US)
1st May 2026
28AQI (US)
2nd May 2026
41AQI (US)
3rd May 2026
41AQI (US)
4th May 2026
53AQI (US)
5th May 2026
39AQI (US)
6th May 2026
28AQI (US)
7th May 2026
29AQI (US)
8th May 2026
43AQI (US)
9th May 2026
10th May 2026
33AQI (US)
11th May 2026
23AQI (US)
12th May 2026
25AQI (US)
13th May 2026
24AQI (US)
14th May 2026
22AQI (US)
15th May 2026
32AQI (US)
16th May 2026
34AQI (US)
17th May 2026
38AQI (US)
18th May 2026
33AQI (US)
19th May 2026
34AQI (US)
20th May 2026
33AQI (US)
21st May 2026
36AQI (US)
22nd May 2026
32AQI (US)
23rd May 2026
43AQI (US)
24th May 2026
61AQI (US)
25th May 2026
40AQI (US)
26th May 2026
41AQI (US)
27th May 2026
54AQI (US)
28th May 2026
52AQI (US)
29th May 2026
33AQI (US)
30th May 2026
26AQI (US)
31st May 2026
26AQI (US)
1st June 2026
28AQI (US)
2nd June 2026
27AQI (US)
3rd June 2026
27AQI (US)
4th June 2026
24AQI (US)
5th June 2026
25AQI (US)
6th June 2026
23AQI (US)
7th June 2026
23AQI (US)
8th June 2026
23AQI (US)
9th June 2026
23AQI (US)
10th June 2026
25AQI (US)
11th June 2026
24AQI (US)
12th June 2026
23AQI (US)
13th June 2026
22AQI (US)
14th June 2026
22AQI (US)
15th June 2026
24AQI (US)
16th June 2026
25AQI (US)
17th June 2026
24AQI (US)
18th June 2026
24AQI (US)
19th June 2026
24AQI (US)
20th June 2026
22AQI (US)
21st June 2026
21AQI (US)
22nd June 2026
22AQI (US)
23rd June 2026
25AQI (US)
24th June 2026
44AQI (US)
25th June 2026
28AQI (US)
26th June 2026
30AQI (US)
27th June 2026
32AQI (US)
28th June 2026
24AQI (US)
29th June 2026
22AQI (US)
30th June 2026
24AQI (US)
1st July 2026
24AQI (US)
2nd July 2026
23AQI (US)
3rd July 2026
26AQI (US)
4th July 2026
23AQI (US)
5th July 2026
21AQI (US)
6th July 2026
23AQI (US)
7th July 2026
25AQI (US)
8th July 2026
26AQI (US)
9th July 2026
27AQI (US)
10th July 2026
30AQI (US)
11th July 2026
29AQI (US)
12th July 2026
27AQI (US)
13th July 2026
29AQI (US)
14th July 2026
29AQI (US)
15th July 2026
26AQI (US)
16th July 2026
41AQI (US)
17th July 2026
42AQI (US)
18th July 2026
48AQI (US)
19th July 2026
24AQI (US)
20th July 2026
28AQI (US)
21st July 2026
31AQI (US)
22nd July 2026
36AQI (US)
23rd July 2026
29AQI (US)
24th July 2026
34AQI (US)
25th July 2026
32AQI (US)
26th July 2026
33AQI (US)
27th July 2026
30AQI (US)
28th July 2026
31AQI (US)
29th July 2026
30AQI (US)
30th July 2026
28AQI (US)
31st July 2026
25AQI (US)
1st August 2026
26AQI (US)
2nd August 2026
28AQI (US)
3rd August 2026
40AQI (US)
4th August 2026
42AQI (US)
5th August 2026
28AQI (US)
6th August 2026
24AQI (US)
7th August 2026
25AQI (US)
8th August 2026
26AQI (US)
9th August 2026
33AQI (US)
10th August 2026
28AQI (US)
11th August 2026
25AQI (US)
12th August 2026
39AQI (US)
13th August 2026
47AQI (US)
14th August 2026
37AQI (US)
15th August 2026
30AQI (US)
16th August 2026
52AQI (US)
17th August 2026
42AQI (US)
18th August 2026
26AQI (US)
19th August 2026
90AQI (US)
20th August 2026
43AQI (US)
21st August 2026
64AQI (US)
22nd August 2026
79AQI (US)
23rd August 2026
34AQI (US)
24th August 2026
27AQI (US)
25th August 2026
27AQI (US)
26th August 2026
41AQI (US)
27th August 2026
44AQI (US)
28th August 2026
28AQI (US)
29th August 2026
27AQI (US)
30th August 2026
30AQI (US)
31st August 2026
28AQI (US)
1st September 2026
27AQI (US)
2nd September 2026
26AQI (US)
3rd September 2026
26AQI (US)
4th September 2026
26AQI (US)
5th September 2026
29AQI (US)
6th September 2026
27AQI (US)
7th September 2026
29AQI (US)
8th September 2026
26AQI (US)
9th September 2026
28AQI (US)
10th September 2026
33AQI (US)
11th September 2026
29AQI (US)
12th September 2026
30AQI (US)
13th September 2026
23AQI (US)
14th September 2026
26AQI (US)
15th September 2026
26AQI (US)
16th September 2026
27AQI (US)
17th September 2026
26AQI (US)
18th September 2026
33AQI (US)
19th September 2026
28AQI (US)
20th September 2026
24AQI (US)
21st September 2026
45AQI (US)
22nd September 2026
51AQI (US)
23rd September 2026
35AQI (US)
24th September 2026
27AQI (US)
25th September 2026
32AQI (US)
26th September 2026
28AQI (US)
27th September 2026
29AQI (US)
28th September 2026
29th September 2026
30th September 2026
1st October 2026
2nd October 2026
3rd October 2026
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026

40AQI (US)

43AQI (US)

40AQI (US)

30AQI (US)

36AQI (US)

25AQI (US)

29AQI (US)

37AQI (US)

29AQI (US)

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202634AQI (US)

22
9
24
4
23
8
28
26
4
30
31
27
4
26
1
237
30

Highest AQI (US) recorded in

February

43AQI (US)

Lowest AQI (US) recorded in

June

25AQI (US)

202540AQI (US)

15
16
13
15
10
20
1
22
8
29
2
29
1
31
27
4
28
2
18
13
23
7
25
6
270
94
1

Highest AQI (US) recorded in

March

60AQI (US)

Lowest AQI (US) recorded in

September

26AQI (US)

202435AQI (US)

13
3
1
1
1
1
12
30
31
30
1
22
7
26
5
21
9
31
219
25
1

Highest AQI (US) recorded in

March

67AQI (US)

Lowest AQI (US) recorded in

April

4AQI (US)

202339AQI (US)

21
10
17
8
1
25
1
14
14
29
2
22
8
30
1
14
2
1
28
3
202
48
1

Highest AQI (US) recorded in

February

49AQI (US)

Lowest AQI (US) recorded in

August

28AQI (US)

202243AQI (US)

29
1
21
29
2
22
8
25
6
27
3
21
3
1
12
1
23
8
25
5
16
15
251
52

Highest AQI (US) recorded in

December

51AQI (US)

Lowest AQI (US) recorded in

August

22AQI (US)

202143AQI (US)

23
7
23
5
19
10
2
26
4
26
5
23
7
24
7
31
23
6
1
31
30
31
310
51
3

Highest AQI (US) recorded in

September

54AQI (US)

Lowest AQI (US) recorded in

April

33AQI (US)

202038AQI (US)

9
4
13
5
3
18
25
5
28
1
20
9
1
26
4
30
1
19
8
3
25
5
1
213
42
8

Highest AQI (US) recorded in

April

55AQI (US)

Lowest AQI (US) recorded in

July

25AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2022(Avg.)
43AQI (US)
Least Polluted Year Recorded
2026(Avg.)
34AQI (US)

Stanmore's annual 2026 AQI (US) (34) shows an average percentage change of -13.8% (improved AQI (US)) compared to previous years: 2020 (38), 2021 (43), 2022 (43), 2023 (39), 2024 (35), 2025 (40).