Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Norristown, Plymouth Township, Pennsylvania, United States 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+

August Air Quality Analysis

Norristown, Plymouth Township, Pennsylvania, United States

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
5th Aug 2025
81AQI
Lowest AQI recorded on
30th Aug 2024
19AQI

Same Day Analysis (10th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 35 of Good air quality, showing improvement over 2024, 2023 and 2021 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 10th Aug - 11th Aug 2025

Norristown, Plymouth Township, Pennsylvania, United States

AQI
Day
Night
.

5 AM10th Aug 2025

8 PM

4 AM11th Aug 2025

Day time
Avg. Highest Time
6PM10th Aug

45AQI

Avg. Lowest Time
6AM10th Aug

32AQI

Night time
Avg. Highest Time
9PM10th Aug

44AQI

Avg. Lowest Time
5AM10th Aug

31AQI

In the last 24 hours,

Norristown's AQI reached its highest point of 45 at 6 PM during the Day, while the lowest point, 31, was recorded at 5 AM during the Night between 10th Aug and 11th Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Norristown, Plymouth Township, Pennsylvania, United States

JulAug
12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th
Day
Night
12th Jul 2025285 AMAQI
12th Jul 2025296 AMAQI
12th Jul 2025307 AMAQI
12th Jul 2025288 AMAQI
12th Jul 2025289 AMAQI
12th Jul 20252910 AMAQI
12th Jul 20253211 AMAQI
12th Jul 20253312 PMAQI
12th Jul 2025341 PMAQI
12th Jul 2025362 PMAQI
12th Jul 2025353 PMAQI
12th Jul 2025354 PMAQI
12th Jul 2025355 PMAQI
12th Jul 2025336 PMAQI
12th Jul 2025347 PMAQI
12th Jul 2025328 PMAQI
12th Jul 2025309 PMAQI
12th Jul 20253110 PMAQI
12th Jul 20252911 PMAQI
13th Jul 20253012 AMAQI
13th Jul 2025301 AMAQI
13th Jul 2025242 AMAQI
13th Jul 2025263 AMAQI
13th Jul 2025214 AMAQI

28°C23/34°C

13th Jul 2025205 AMAQI
13th Jul 2025216 AMAQI
13th Jul 2025227 AMAQI
13th Jul 2025228 AMAQI
13th Jul 2025209 AMAQI
13th Jul 20252110 AMAQI
13th Jul 20252211 AMAQI
13th Jul 20252312 PMAQI
13th Jul 2025241 PMAQI
13th Jul 2025242 PMAQI
13th Jul 2025243 PMAQI
13th Jul 2025244 PMAQI
13th Jul 2025245 PMAQI
13th Jul 2025246 PMAQI
13th Jul 2025247 PMAQI
13th Jul 2025248 PMAQI
13th Jul 2025239 PMAQI
13th Jul 20252310 PMAQI
13th Jul 20252311 PMAQI
14th Jul 20252212 AMAQI
14th Jul 2025221 AMAQI
14th Jul 2025212 AMAQI
14th Jul 2025213 AMAQI
14th Jul 2025214 AMAQI

27°C22/35°C

14th Jul 2025215 AMAQI
14th Jul 2025226 AMAQI
14th Jul 2025237 AMAQI
14th Jul 2025248 AMAQI
14th Jul 2025259 AMAQI
14th Jul 20252610 AMAQI
14th Jul 20252711 AMAQI
14th Jul 20253012 PMAQI
14th Jul 2025341 PMAQI
14th Jul 2025322 PMAQI
14th Jul 2025323 PMAQI
14th Jul 2025304 PMAQI
14th Jul 2025315 PMAQI
14th Jul 2025306 PMAQI
14th Jul 2025267 PMAQI
14th Jul 2025268 PMAQI
14th Jul 2025269 PMAQI
14th Jul 20252310 PMAQI
14th Jul 20252311 PMAQI
15th Jul 20252312 AMAQI
15th Jul 2025221 AMAQI
15th Jul 2025182 AMAQI
15th Jul 2025183 AMAQI
15th Jul 2025194 AMAQI

25°C23/28°C

15th Jul 2025205 AMAQI
15th Jul 2025216 AMAQI
15th Jul 2025207 AMAQI
15th Jul 2025208 AMAQI
15th Jul 2025219 AMAQI
15th Jul 20252310 AMAQI
15th Jul 20252411 AMAQI
15th Jul 20252412 PMAQI
15th Jul 2025261 PMAQI
15th Jul 2025272 PMAQI
15th Jul 2025263 PMAQI
15th Jul 2025264 PMAQI
15th Jul 2025265 PMAQI
15th Jul 2025256 PMAQI
15th Jul 2025247 PMAQI
15th Jul 2025248 PMAQI
15th Jul 2025289 PMAQI
15th Jul 20252710 PMAQI
15th Jul 20252811 PMAQI
16th Jul 20252712 AMAQI
16th Jul 2025281 AMAQI
16th Jul 2025292 AMAQI
16th Jul 2025303 AMAQI
16th Jul 2025314 AMAQI

27°C22/32°C

16th Jul 2025325 AMAQI
16th Jul 2025326 AMAQI
16th Jul 2025347 AMAQI
16th Jul 2025338 AMAQI
16th Jul 2025329 AMAQI
16th Jul 20253410 AMAQI
16th Jul 20253611 AMAQI
16th Jul 20253612 PMAQI
16th Jul 2025351 PMAQI
16th Jul 2025362 PMAQI
16th Jul 2025353 PMAQI
16th Jul 2025354 PMAQI
16th Jul 2025345 PMAQI
16th Jul 2025326 PMAQI
16th Jul 2025337 PMAQI
16th Jul 2025338 PMAQI
16th Jul 2025339 PMAQI
16th Jul 20253410 PMAQI
16th Jul 20253411 PMAQI
17th Jul 20253212 AMAQI
17th Jul 2025271 AMAQI
17th Jul 2025182 AMAQI
17th Jul 2025183 AMAQI
17th Jul 2025184 AMAQI

27°C23/34°C

17th Jul 2025185 AMAQI
17th Jul 2025176 AMAQI
17th Jul 2025197 AMAQI
17th Jul 2025208 AMAQI
17th Jul 2025249 AMAQI
17th Jul 20252610 AMAQI
17th Jul 20252811 AMAQI
17th Jul 20253212 PMAQI
17th Jul 2025331 PMAQI
17th Jul 2025342 PMAQI
17th Jul 2025333 PMAQI
17th Jul 2025324 PMAQI
17th Jul 2025305 PMAQI
17th Jul 2025316 PMAQI
17th Jul 2025297 PMAQI
17th Jul 2025308 PMAQI
17th Jul 2025329 PMAQI
17th Jul 20253010 PMAQI
17th Jul 20252811 PMAQI
18th Jul 20252612 AMAQI
18th Jul 2025261 AMAQI
18th Jul 2025202 AMAQI
18th Jul 2025193 AMAQI
18th Jul 2025194 AMAQI

29°C23/37°C

18th Jul 2025205 AMAQI
18th Jul 2025226 AMAQI
18th Jul 2025237 AMAQI
18th Jul 2025238 AMAQI
18th Jul 2025239 AMAQI
18th Jul 20252210 AMAQI
18th Jul 20252211 AMAQI
18th Jul 20252212 PMAQI
18th Jul 2025221 PMAQI
18th Jul 2025222 PMAQI
18th Jul 2025213 PMAQI
18th Jul 2025224 PMAQI
18th Jul 2025225 PMAQI
18th Jul 2025216 PMAQI
18th Jul 2025227 PMAQI
18th Jul 2025228 PMAQI
18th Jul 2025219 PMAQI
18th Jul 20252210 PMAQI
18th Jul 20252311 PMAQI
19th Jul 20252212 AMAQI
19th Jul 2025221 AMAQI
19th Jul 2025222 AMAQI
19th Jul 2025223 AMAQI
19th Jul 2025224 AMAQI

26°C22/29°C

19th Jul 2025235 AMAQI
19th Jul 2025256 AMAQI
19th Jul 2025247 AMAQI
19th Jul 2025258 AMAQI
19th Jul 2025269 AMAQI
19th Jul 20252410 AMAQI
19th Jul 20252411 AMAQI
19th Jul 20252312 PMAQI
19th Jul 2025231 PMAQI
19th Jul 2025222 PMAQI
19th Jul 2025243 PMAQI
19th Jul 2025244 PMAQI
19th Jul 2025245 PMAQI
19th Jul 2025246 PMAQI
19th Jul 2025247 PMAQI
19th Jul 2025248 PMAQI
19th Jul 2025259 PMAQI
19th Jul 20252510 PMAQI
19th Jul 20252611 PMAQI
20th Jul 20252612 AMAQI
20th Jul 2025261 AMAQI
20th Jul 2025262 AMAQI
20th Jul 2025273 AMAQI
20th Jul 2025294 AMAQI

25°C22/29°C

20th Jul 2025325 AMAQI
20th Jul 2025336 AMAQI
20th Jul 2025327 AMAQI
20th Jul 2025328 AMAQI
20th Jul 2025359 AMAQI
20th Jul 20253110 AMAQI
20th Jul 20253011 AMAQI
20th Jul 20253012 PMAQI
20th Jul 2025311 PMAQI
20th Jul 2025322 PMAQI
20th Jul 2025323 PMAQI
20th Jul 2025334 PMAQI
20th Jul 2025325 PMAQI
20th Jul 2025336 PMAQI
20th Jul 2025307 PMAQI
20th Jul 2025308 PMAQI
20th Jul 2025289 PMAQI
20th Jul 20252810 PMAQI
20th Jul 20253111 PMAQI
21st Jul 20253012 AMAQI
21st Jul 2025301 AMAQI
21st Jul 2025272 AMAQI
21st Jul 2025293 AMAQI
21st Jul 2025284 AMAQI

28°C24/34°C

21st Jul 2025285 AMAQI
21st Jul 2025276 AMAQI
21st Jul 2025277 AMAQI
21st Jul 2025288 AMAQI
21st Jul 2025289 AMAQI
21st Jul 20253210 AMAQI
21st Jul 20253311 AMAQI
21st Jul 20253412 PMAQI
21st Jul 2025381 PMAQI
21st Jul 2025392 PMAQI
21st Jul 2025393 PMAQI
21st Jul 2025454 PMAQI
21st Jul 2025465 PMAQI
21st Jul 2025476 PMAQI
21st Jul 2025357 PMAQI
21st Jul 2025308 PMAQI
21st Jul 2025379 PMAQI
21st Jul 20253810 PMAQI
21st Jul 20254011 PMAQI
22nd Jul 20253912 AMAQI
22nd Jul 2025431 AMAQI
22nd Jul 2025542 AMAQI
22nd Jul 2025523 AMAQI
22nd Jul 2025504 AMAQI

25°C19/32°C

22nd Jul 2025455 AMAQI
22nd Jul 2025426 AMAQI
22nd Jul 2025427 AMAQI
22nd Jul 2025398 AMAQI
22nd Jul 2025369 AMAQI
22nd Jul 20253910 AMAQI
22nd Jul 20254111 AMAQI
22nd Jul 20254312 PMAQI
22nd Jul 2025451 PMAQI
22nd Jul 2025472 PMAQI
22nd Jul 2025503 PMAQI
22nd Jul 2025514 PMAQI
22nd Jul 2025525 PMAQI
22nd Jul 2025526 PMAQI
22nd Jul 2025517 PMAQI
22nd Jul 2025478 PMAQI
22nd Jul 2025479 PMAQI
22nd Jul 20254610 PMAQI
22nd Jul 20254611 PMAQI
23rd Jul 20254412 AMAQI
23rd Jul 2025411 AMAQI
23rd Jul 2025372 AMAQI
23rd Jul 2025353 AMAQI
23rd Jul 2025334 AMAQI

23°C17/28°C

23rd Jul 2025325 AMAQI
23rd Jul 2025346 AMAQI
23rd Jul 2025357 AMAQI
23rd Jul 2025368 AMAQI
23rd Jul 2025359 AMAQI
23rd Jul 20253610 AMAQI
23rd Jul 20253611 AMAQI
23rd Jul 20253712 PMAQI
23rd Jul 2025381 PMAQI
23rd Jul 2025382 PMAQI
23rd Jul 2025413 PMAQI
23rd Jul 2025404 PMAQI
23rd Jul 2025405 PMAQI
23rd Jul 2025416 PMAQI
23rd Jul 2025397 PMAQI
23rd Jul 2025388 PMAQI
23rd Jul 2025379 PMAQI
23rd Jul 20253410 PMAQI
23rd Jul 20253411 PMAQI
24th Jul 20253312 AMAQI
24th Jul 2025321 AMAQI
24th Jul 2025232 AMAQI
24th Jul 2025243 AMAQI
24th Jul 2025264 AMAQI

24°C20/28°C

24th Jul 2025265 AMAQI
24th Jul 2025286 AMAQI
24th Jul 2025297 AMAQI
24th Jul 2025308 AMAQI
24th Jul 2025319 AMAQI
24th Jul 20253210 AMAQI
24th Jul 20253611 AMAQI
24th Jul 20253812 PMAQI
24th Jul 2025411 PMAQI
24th Jul 2025422 PMAQI
24th Jul 2025433 PMAQI
24th Jul 2025424 PMAQI
24th Jul 2025395 PMAQI
24th Jul 2025396 PMAQI
24th Jul 2025367 PMAQI
24th Jul 2025368 PMAQI
24th Jul 2025389 PMAQI
24th Jul 20253610 PMAQI
24th Jul 20253611 PMAQI
25th Jul 20253512 AMAQI
25th Jul 2025381 AMAQI
25th Jul 2025392 AMAQI
25th Jul 2025363 AMAQI
25th Jul 2025374 AMAQI

27°C19/35°C

25th Jul 2025375 AMAQI
25th Jul 2025386 AMAQI
25th Jul 2025397 AMAQI
25th Jul 2025438 AMAQI
25th Jul 2025509 AMAQI
25th Jul 20255110 AMAQI
25th Jul 20255211 AMAQI
25th Jul 20255212 PMAQI
25th Jul 2025521 PMAQI
25th Jul 2025532 PMAQI
25th Jul 2025523 PMAQI
25th Jul 2025524 PMAQI
25th Jul 2025525 PMAQI
25th Jul 2025506 PMAQI
25th Jul 2025477 PMAQI
25th Jul 2025458 PMAQI
25th Jul 2025389 PMAQI
25th Jul 20253810 PMAQI
25th Jul 20253811 PMAQI
26th Jul 20253812 AMAQI
26th Jul 2025361 AMAQI
26th Jul 2025282 AMAQI
26th Jul 2025283 AMAQI
26th Jul 2025294 AMAQI

29°C22/39°C

26th Jul 2025295 AMAQI
26th Jul 2025316 AMAQI
26th Jul 2025317 AMAQI
26th Jul 2025328 AMAQI
26th Jul 2025349 AMAQI
26th Jul 20254110 AMAQI
26th Jul 20254811 AMAQI
26th Jul 20255012 PMAQI
26th Jul 2025531 PMAQI
26th Jul 2025502 PMAQI
26th Jul 2025483 PMAQI
26th Jul 2025464 PMAQI
26th Jul 2025385 PMAQI
26th Jul 2025396 PMAQI
26th Jul 2025387 PMAQI
26th Jul 2025388 PMAQI
26th Jul 2025389 PMAQI
26th Jul 20254110 PMAQI
26th Jul 20253911 PMAQI
27th Jul 20254012 AMAQI
27th Jul 2025461 AMAQI
27th Jul 2025902 AMAQI
27th Jul 2025943 AMAQI
27th Jul 2025904 AMAQI

27°C22/32°C

27th Jul 2025965 AMAQI
27th Jul 2025906 AMAQI
27th Jul 2025917 AMAQI
27th Jul 2025898 AMAQI
27th Jul 2025919 AMAQI
27th Jul 20258310 AMAQI
27th Jul 20258011 AMAQI
27th Jul 20257812 PMAQI
27th Jul 2025701 PMAQI
27th Jul 2025712 PMAQI
27th Jul 2025693 PMAQI
27th Jul 2025694 PMAQI
27th Jul 2025665 PMAQI
27th Jul 2025656 PMAQI
27th Jul 2025767 PMAQI
27th Jul 2025758 PMAQI
27th Jul 2025649 PMAQI
27th Jul 20256210 PMAQI
27th Jul 20256211 PMAQI
28th Jul 20256112 AMAQI
28th Jul 2025581 AMAQI
28th Jul 2025312 AMAQI
28th Jul 2025293 AMAQI
28th Jul 2025304 AMAQI

26°C22/30°C

28th Jul 2025305 AMAQI
28th Jul 2025346 AMAQI
28th Jul 2025377 AMAQI
28th Jul 2025388 AMAQI
28th Jul 2025399 AMAQI
28th Jul 20254010 AMAQI
28th Jul 20254211 AMAQI
28th Jul 20254412 PMAQI
28th Jul 2025451 PMAQI
28th Jul 2025472 PMAQI
28th Jul 2025473 PMAQI
28th Jul 2025484 PMAQI
28th Jul 2025485 PMAQI
28th Jul 2025486 PMAQI
28th Jul 2025427 PMAQI
28th Jul 2025428 PMAQI
28th Jul 2025489 PMAQI
28th Jul 20254710 PMAQI
28th Jul 20254911 PMAQI
29th Jul 20254812 AMAQI
29th Jul 2025481 AMAQI
29th Jul 2025492 AMAQI
29th Jul 2025503 AMAQI
29th Jul 2025514 AMAQI

29°C22/35°C

29th Jul 2025505 AMAQI
29th Jul 2025526 AMAQI
29th Jul 2025527 AMAQI
29th Jul 2025538 AMAQI
29th Jul 2025539 AMAQI
29th Jul 20255210 AMAQI
29th Jul 20255311 AMAQI
29th Jul 20255312 PMAQI
29th Jul 2025531 PMAQI
29th Jul 2025532 PMAQI
29th Jul 2025533 PMAQI
29th Jul 2025544 PMAQI
29th Jul 2025555 PMAQI
29th Jul 2025546 PMAQI
29th Jul 2025537 PMAQI
29th Jul 2025548 PMAQI
29th Jul 2025549 PMAQI
29th Jul 20255310 PMAQI
29th Jul 20255411 PMAQI
30th Jul 20255412 AMAQI
30th Jul 2025541 AMAQI
30th Jul 2025532 AMAQI
30th Jul 2025543 AMAQI
30th Jul 2025544 AMAQI

30°C22/38°C

30th Jul 2025545 AMAQI
30th Jul 2025556 AMAQI
30th Jul 2025567 AMAQI
30th Jul 2025558 AMAQI
30th Jul 2025569 AMAQI
30th Jul 20255410 AMAQI
30th Jul 20255511 AMAQI
30th Jul 20255512 PMAQI
30th Jul 2025561 PMAQI
30th Jul 2025552 PMAQI
30th Jul 2025553 PMAQI
30th Jul 2025554 PMAQI
30th Jul 2025555 PMAQI
30th Jul 2025556 PMAQI
30th Jul 2025557 PMAQI
30th Jul 2025558 PMAQI
30th Jul 2025559 PMAQI
30th Jul 20255610 PMAQI
30th Jul 20255711 PMAQI
31st Jul 20255612 AMAQI
31st Jul 2025551 AMAQI
31st Jul 2025542 AMAQI
31st Jul 2025533 AMAQI
31st Jul 2025544 AMAQI

30°C22/36°C

31st Jul 2025525 AMAQI
31st Jul 2025546 AMAQI
31st Jul 2025557 AMAQI
31st Jul 2025558 AMAQI
31st Jul 2025569 AMAQI
31st Jul 20255510 AMAQI
31st Jul 20255611 AMAQI
31st Jul 20255512 PMAQI
31st Jul 2025561 PMAQI
31st Jul 2025562 PMAQI
31st Jul 2025563 PMAQI
31st Jul 2025534 PMAQI
31st Jul 2025435 PMAQI
31st Jul 2025366 PMAQI
31st Jul 2025567 PMAQI
31st Jul 2025588 PMAQI
31st Jul 2025609 PMAQI
31st Jul 20255710 PMAQI
31st Jul 20255411 PMAQI
1st Aug 20254512 AMAQI
1st Aug 2025401 AMAQI
1st Aug 2025382 AMAQI
1st Aug 2025263 AMAQI
1st Aug 2025224 AMAQI

28°C19/37°C

1st Aug 2025195 AMAQI
1st Aug 2025196 AMAQI
1st Aug 2025237 AMAQI
1st Aug 2025288 AMAQI
1st Aug 2025329 AMAQI
1st Aug 20253210 AMAQI
1st Aug 20253311 AMAQI
1st Aug 20253412 PMAQI
1st Aug 2025391 PMAQI
1st Aug 2025442 PMAQI
1st Aug 2025473 PMAQI
1st Aug 2025444 PMAQI
1st Aug 2025455 PMAQI
1st Aug 2025446 PMAQI
1st Aug 2025397 PMAQI
1st Aug 2025428 PMAQI
1st Aug 2025489 PMAQI
1st Aug 20254810 PMAQI
1st Aug 20255111 PMAQI
2nd Aug 20255212 AMAQI
2nd Aug 2025511 AMAQI
2nd Aug 2025522 AMAQI
2nd Aug 2025533 AMAQI
2nd Aug 2025534 AMAQI

21°C18/24°C

2nd Aug 2025535 AMAQI
2nd Aug 2025516 AMAQI
2nd Aug 2025507 AMAQI
2nd Aug 2025468 AMAQI
2nd Aug 2025449 AMAQI
2nd Aug 20254010 AMAQI
2nd Aug 20253811 AMAQI
2nd Aug 20253812 PMAQI
2nd Aug 2025341 PMAQI
2nd Aug 2025332 PMAQI
2nd Aug 2025303 PMAQI
2nd Aug 2025314 PMAQI
2nd Aug 2025305 PMAQI
2nd Aug 2025326 PMAQI
2nd Aug 2025387 PMAQI
2nd Aug 2025388 PMAQI
2nd Aug 2025369 PMAQI
2nd Aug 20254010 PMAQI
2nd Aug 20254911 PMAQI
3rd Aug 20255112 AMAQI
3rd Aug 2025521 AMAQI
3rd Aug 2025522 AMAQI
3rd Aug 2025533 AMAQI
3rd Aug 2025524 AMAQI

22°C15/28°C

3rd Aug 2025515 AMAQI
3rd Aug 2025516 AMAQI
3rd Aug 2025487 AMAQI
3rd Aug 2025498 AMAQI
3rd Aug 2025509 AMAQI
3rd Aug 20255110 AMAQI
3rd Aug 20255211 AMAQI
3rd Aug 20255212 PMAQI
3rd Aug 2025501 PMAQI
3rd Aug 2025522 PMAQI
3rd Aug 2025503 PMAQI
3rd Aug 2025494 PMAQI
3rd Aug 2025505 PMAQI
3rd Aug 2025496 PMAQI
3rd Aug 2025507 PMAQI
3rd Aug 2025478 PMAQI
3rd Aug 2025489 PMAQI
3rd Aug 20255010 PMAQI
3rd Aug 20255211 PMAQI
4th Aug 20255212 AMAQI
4th Aug 2025511 AMAQI
4th Aug 2025502 AMAQI
4th Aug 2025523 AMAQI
4th Aug 2025524 AMAQI

24°C14/32°C

4th Aug 2025535 AMAQI
4th Aug 2025546 AMAQI
4th Aug 2025537 AMAQI
4th Aug 2025548 AMAQI
4th Aug 2025569 AMAQI
4th Aug 20255710 AMAQI
4th Aug 20256211 AMAQI
4th Aug 20256612 PMAQI
4th Aug 2025741 PMAQI
4th Aug 2025772 PMAQI
4th Aug 2025793 PMAQI
4th Aug 2025804 PMAQI
4th Aug 2025855 PMAQI
4th Aug 2025856 PMAQI
4th Aug 2025547 PMAQI
4th Aug 2025688 PMAQI
4th Aug 2025789 PMAQI
4th Aug 20257610 PMAQI
4th Aug 20257411 PMAQI
5th Aug 20257012 AMAQI
5th Aug 2025711 AMAQI
5th Aug 2025732 AMAQI
5th Aug 2025763 AMAQI
5th Aug 2025754 AMAQI

25°C14/34°C

5th Aug 2025775 AMAQI
5th Aug 2025786 AMAQI
5th Aug 2025767 AMAQI
5th Aug 2025808 AMAQI
5th Aug 2025779 AMAQI
5th Aug 20258010 AMAQI
5th Aug 20258011 AMAQI
5th Aug 20258312 PMAQI
5th Aug 2025851 PMAQI
5th Aug 2025872 PMAQI
5th Aug 2025923 PMAQI
5th Aug 2025884 PMAQI
5th Aug 2025895 PMAQI
5th Aug 2025916 PMAQI
5th Aug 2025807 PMAQI
5th Aug 2025848 PMAQI
5th Aug 2025879 PMAQI
5th Aug 20258610 PMAQI
5th Aug 20258211 PMAQI
6th Aug 20258312 AMAQI
6th Aug 2025811 AMAQI
6th Aug 2025782 AMAQI
6th Aug 2025793 AMAQI
6th Aug 2025774 AMAQI

25°C16/32°C

6th Aug 2025765 AMAQI
6th Aug 2025776 AMAQI
6th Aug 2025767 AMAQI
6th Aug 2025758 AMAQI
6th Aug 2025749 AMAQI
6th Aug 20257610 AMAQI
6th Aug 20257811 AMAQI
6th Aug 20258312 PMAQI
6th Aug 2025841 PMAQI
6th Aug 2025812 PMAQI
6th Aug 2025793 PMAQI
6th Aug 2025804 PMAQI
6th Aug 2025815 PMAQI
6th Aug 2025766 PMAQI
6th Aug 2025827 PMAQI
6th Aug 2025738 PMAQI
6th Aug 2025629 PMAQI
6th Aug 20255810 PMAQI
6th Aug 20254911 PMAQI
7th Aug 20255612 AMAQI
7th Aug 2025621 AMAQI
7th Aug 2025322 AMAQI
7th Aug 2025323 AMAQI
7th Aug 2025304 AMAQI

23°C21/26°C

7th Aug 2025315 AMAQI
7th Aug 2025346 AMAQI
7th Aug 2025397 AMAQI
7th Aug 2025448 AMAQI
7th Aug 2025459 AMAQI
7th Aug 20255610 AMAQI
7th Aug 20256411 AMAQI
7th Aug 20256612 PMAQI
7th Aug 2025701 PMAQI
7th Aug 2025732 PMAQI
7th Aug 2025683 PMAQI
7th Aug 2025664 PMAQI
7th Aug 2025645 PMAQI
7th Aug 2025626 PMAQI
7th Aug 2025567 PMAQI
7th Aug 2025548 PMAQI
7th Aug 2025549 PMAQI
7th Aug 20255310 PMAQI
7th Aug 20255211 PMAQI
8th Aug 20255012 AMAQI
8th Aug 2025431 AMAQI
8th Aug 2025312 AMAQI
8th Aug 2025303 AMAQI
8th Aug 2025294 AMAQI

24°C20/32°C

8th Aug 2025275 AMAQI
8th Aug 2025296 AMAQI
8th Aug 2025317 AMAQI
8th Aug 2025308 AMAQI
8th Aug 2025299 AMAQI
8th Aug 20252810 AMAQI
8th Aug 20253011 AMAQI
8th Aug 20253312 PMAQI
8th Aug 2025311 PMAQI
8th Aug 2025332 PMAQI
8th Aug 2025343 PMAQI
8th Aug 2025334 PMAQI
8th Aug 2025325 PMAQI
8th Aug 2025326 PMAQI
8th Aug 2025337 PMAQI
8th Aug 2025348 PMAQI
8th Aug 2025339 PMAQI
8th Aug 20253410 PMAQI
8th Aug 20253411 PMAQI
9th Aug 20253512 AMAQI
9th Aug 2025361 AMAQI
9th Aug 2025322 AMAQI
9th Aug 2025323 AMAQI
9th Aug 2025324 AMAQI

23°C16/31°C

9th Aug 2025335 AMAQI
9th Aug 2025336 AMAQI
9th Aug 2025357 AMAQI
9th Aug 2025348 AMAQI
9th Aug 2025369 AMAQI
9th Aug 20253510 AMAQI
9th Aug 20253611 AMAQI
9th Aug 20253412 PMAQI
9th Aug 2025341 PMAQI
9th Aug 2025372 PMAQI
9th Aug 2025373 PMAQI
9th Aug 2025364 PMAQI
9th Aug 2025365 PMAQI
9th Aug 2025386 PMAQI
9th Aug 2025377 PMAQI
9th Aug 2025388 PMAQI
9th Aug 2025389 PMAQI
9th Aug 20253810 PMAQI
9th Aug 20253911 PMAQI
10th Aug 20253712 AMAQI
10th Aug 2025341 AMAQI
10th Aug 2025302 AMAQI
10th Aug 2025293 AMAQI
10th Aug 2025304 AMAQI

24°C14/32°C

10th Aug 2025315 AMAQI
10th Aug 2025326 AMAQI
10th Aug 2025347 AMAQI
10th Aug 2025338 AMAQI
10th Aug 2025339 AMAQI
10th Aug 20253310 AMAQI
10th Aug 20253311 AMAQI
10th Aug 20253512 PMAQI
10th Aug 2025401 PMAQI
10th Aug 2025422 PMAQI
10th Aug 2025423 PMAQI
10th Aug 2025434 PMAQI
10th Aug 2025445 PMAQI
10th Aug 2025456 PMAQI
10th Aug 2025407 PMAQI
10th Aug 2025398 PMAQI
10th Aug 2025449 PMAQI
10th Aug 20254310 PMAQI
10th Aug 20254211 PMAQI
11th Aug 20254012 AMAQI
11th Aug 2025381 AMAQI
11th Aug 2025362 AMAQI
11th Aug 2025363 AMAQI
11th Aug 2025374 AMAQI

25°C15/34°C

11th Aug 2025385 AMAQI
5 AM
11th Aug 2025426 AMAQI
11th Aug 2025447 AMAQI
11th Aug 2025448 AMAQI
11th Aug 2025439 AMAQI
11th Aug 20254410 AMAQI
11th Aug 20254711 AMAQI
11th Aug 20255012 PMAQI
12 PM
11th Aug 2025521 PMAQI
8 PM
12 AM
4 AM

--°C/°C

Day time
Avg. Highest Time
5 AM - 8 PM

43AQI

16 hours / Day
480 hours / Month
Avg. Lowest Time
5 AM - 8 PM

43AQI

16 hours / Day
480 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 PM (Avg. 43), while the lowest AQI was between 5 AM to 8 PM (Avg. 43).
Night time
Avg. Highest Time
9 PM - 11 PM

43AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
2 AM - 4 AM

38AQI

3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 PM to 11 PM (Avg. 43), while the lowest AQI was between 2 AM to 4 AM (Avg. 38).

2025 Days Vs Air Quality

Norristown, Plymouth Township, Pennsylvania, United States

2025

86%

190

14%

32

Total number of days with different AQI categories in last 223 days in 2025 (142 days remaining)

Good
190 Days
Moderate
32 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 86%

Health Risk Level:

Low

In 2025, 86% of 223 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

Norristown, Plymouth Township, Pennsylvania, United States

AQI levels in 2025

AQI
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.

1st January 2025
28AQI
2nd January 2025
20AQI
3rd January 2025
34AQI
4th January 2025
24AQI
5th January 2025
29AQI
6th January 2025
35AQI
7th January 2025
23AQI
8th January 2025
28AQI
9th January 2025
28AQI
10th January 2025
29AQI
11th January 2025
44AQI
12th January 2025
54AQI
13th January 2025
50AQI
14th January 2025
25AQI
15th January 2025
25AQI
16th January 2025
44AQI
17th January 2025
55AQI
18th January 2025
45AQI
19th January 2025
45AQI
20th January 2025
26AQI
21st January 2025
34AQI
22nd January 2025
54AQI
23rd January 2025
70AQI
24th January 2025
67AQI
25th January 2025
62AQI
26th January 2025
48AQI
27th January 2025
44AQI
28th January 2025
31AQI
29th January 2025
28AQI
30th January 2025
27AQI
31st January 2025
44AQI
1st February 2025
31AQI
2nd February 2025
25AQI
3rd February 2025
47AQI
4th February 2025
36AQI
5th February 2025
26AQI
6th February 2025
32AQI
7th February 2025
33AQI
8th February 2025
34AQI
9th February 2025
33AQI
10th February 2025
32AQI
11th February 2025
42AQI
12th February 2025
50AQI
13th February 2025
24AQI
14th February 2025
30AQI
15th February 2025
33AQI
16th February 2025
21AQI
17th February 2025
29AQI
18th February 2025
27AQI
19th February 2025
24AQI
20th February 2025
24AQI
21st February 2025
25AQI
22nd February 2025
38AQI
23rd February 2025
51AQI
24th February 2025
52AQI
25th February 2025
41AQI
26th February 2025
48AQI
27th February 2025
44AQI
28th February 2025
29AQI
1st March 2025
29AQI
2nd March 2025
29AQI
3rd March 2025
33AQI
4th March 2025
39AQI
5th March 2025
27AQI
6th March 2025
23AQI
7th March 2025
31AQI
8th March 2025
30AQI
9th March 2025
29AQI
10th March 2025
32AQI
11th March 2025
37AQI
12th March 2025
29AQI
13th March 2025
32AQI
14th March 2025
44AQI
15th March 2025
37AQI
16th March 2025
32AQI
17th March 2025
21AQI
18th March 2025
18AQI
19th March 2025
30AQI
20th March 2025
27AQI
21st March 2025
18AQI
22nd March 2025
24AQI
23rd March 2025
18AQI
24th March 2025
29AQI
25th March 2025
29AQI
26th March 2025
20AQI
27th March 2025
19AQI
28th March 2025
35AQI
29th March 2025
56AQI
30th March 2025
51AQI
31st March 2025
36AQI
1st April 2025
18AQI
2nd April 2025
21AQI
3rd April 2025
32AQI
4th April 2025
28AQI
5th April 2025
23AQI
6th April 2025
34AQI
7th April 2025
24AQI
8th April 2025
27AQI
9th April 2025
22AQI
10th April 2025
25AQI
11th April 2025
26AQI
12th April 2025
17AQI
13th April 2025
20AQI
14th April 2025
31AQI
15th April 2025
32AQI
16th April 2025
15AQI
17th April 2025
21AQI
18th April 2025
34AQI
19th April 2025
52AQI
20th April 2025
33AQI
21st April 2025
23AQI
22nd April 2025
34AQI
23rd April 2025
23AQI
24th April 2025
55AQI
25th April 2025
34AQI
26th April 2025
32AQI
27th April 2025
14AQI
28th April 2025
19AQI
29th April 2025
34AQI
30th April 2025
37AQI
1st May 2025
23AQI
2nd May 2025
41AQI
3rd May 2025
44AQI
4th May 2025
27AQI
5th May 2025
24AQI
6th May 2025
24AQI
7th May 2025
20AQI
8th May 2025
34AQI
9th May 2025
19AQI
10th May 2025
18AQI
11th May 2025
32AQI
12th May 2025
35AQI
13th May 2025
25AQI
14th May 2025
24AQI
15th May 2025
31AQI
16th May 2025
38AQI
17th May 2025
34AQI
18th May 2025
17AQI
19th May 2025
19AQI
20th May 2025
16AQI
21st May 2025
17AQI
22nd May 2025
13AQI
23rd May 2025
18AQI
24th May 2025
12AQI
25th May 2025
14AQI
26th May 2025
18AQI
27th May 2025
25AQI
28th May 2025
19AQI
29th May 2025
17AQI
30th May 2025
34AQI
31st May 2025
31AQI
1st June 2025
18AQI
2nd June 2025
22AQI
3rd June 2025
30AQI
4th June 2025
48AQI
5th June 2025
54AQI
6th June 2025
55AQI
7th June 2025
39AQI
8th June 2025
30AQI
9th June 2025
25AQI
10th June 2025
33AQI
11th June 2025
56AQI
12th June 2025
63AQI
13th June 2025
70AQI
14th June 2025
65AQI
15th June 2025
34AQI
16th June 2025
35AQI
17th June 2025
33AQI
18th June 2025
27AQI
19th June 2025
31AQI
20th June 2025
27AQI
21st June 2025
46AQI
22nd June 2025
49AQI
23rd June 2025
56AQI
24th June 2025
57AQI
25th June 2025
54AQI
26th June 2025
40AQI
27th June 2025
39AQI
28th June 2025
32AQI
29th June 2025
42AQI
30th June 2025
47AQI
1st July 2025
32AQI
2nd July 2025
29AQI
3rd July 2025
46AQI
4th July 2025
47AQI
5th July 2025
65AQI
6th July 2025
58AQI
7th July 2025
36AQI
8th July 2025
36AQI
9th July 2025
34AQI
10th July 2025
36AQI
11th July 2025
37AQI
12th July 2025
31AQI
13th July 2025
24AQI
14th July 2025
25AQI
15th July 2025
23AQI
16th July 2025
32AQI
17th July 2025
26AQI
18th July 2025
22AQI
19th July 2025
24AQI
20th July 2025
30AQI
21st July 2025
34AQI
22nd July 2025
46AQI
23rd July 2025
37AQI
24th July 2025
33AQI
25th July 2025
43AQI
26th July 2025
38AQI
27th July 2025
75AQI
28th July 2025
42AQI
29th July 2025
52AQI
30th July 2025
55AQI
31st July 2025
54AQI
1st August 2025
37AQI
2nd August 2025
43AQI
3rd August 2025
51AQI
4th August 2025
64AQI
5th August 2025
81AQI
6th August 2025
76AQI
7th August 2025
51AQI
8th August 2025
33AQI
9th August 2025
35AQI
10th August 2025
35AQI

39AQI

34AQI

30AQI

28AQI

25AQI

42AQI

39AQI

51AQI

No. of days

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

202535AQI

25
6
26
2
29
2
28
2
31
21
9
25
6
5
5
190
32

Highest AQI recorded in

August

51AQI

Lowest AQI recorded in

May

25AQI

202434AQI

26
5
25
4
30
1
27
3
30
1
29
1
27
4
25
6
30
30
1
30
26
5
335
31

Highest AQI recorded in

July

37AQI

Lowest AQI recorded in

November

27AQI

202340AQI

26
5
20
8
28
3
28
2
25
6
14
11
2
1
2
24
7
25
6
29
1
31
25
4
23
8
298
61
2
1
2

Highest AQI recorded in

June

71AQI

Lowest AQI recorded in

October

29AQI

202236AQI

21
8
18
4
26
4
17
29
1
27
20
2
1
30
28
3
29
1
25
6
271
29

Highest AQI recorded in

January

41AQI

Lowest AQI recorded in

September

29AQI

202140AQI

22
5
17
5
14
2
21
2
28
3
26
4
15
13
2
25
5
27
3
29
2
23
7
21
10
268
61
2

Highest AQI recorded in

July

55AQI

Lowest AQI recorded in

September

35AQI

202037AQI

5
20
18
29
1
29
2
29
2
27
3
30
1
22
6
22
9
231
24

Highest AQI recorded in

November

44AQI

Lowest AQI recorded in

March

29AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2021(Avg.)
40AQI
Least Polluted Year Recorded
2024(Avg.)
34AQI

Norristown's annual 2025 AQI (35) shows an average percentage change of -6.3% (improved AQI) compared to previous years: 2020 (37), 2021 (40), 2022 (36), 2023 (40), 2024 (34).