Country Background
HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Chester, 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

Chester, Pennsylvania, United States

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
5th Aug 2025
78AQI
Lowest AQI recorded on
21st Aug 2025
16AQI

Same Day Analysis (11th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 51 of Moderate air quality, showing improvement over 2023 on the same day.

Day & Night AQI Trend: 10th Aug - 11th Aug 2026

Chester, Pennsylvania, United States

AQI
Day
Night
.

5 AM10th Aug 2026

8 PM

4 AM11th Aug 2026

Day time
Avg. Highest Time
7PM10th Aug

53AQI

Avg. Lowest Time
6PM10th Aug

44AQI

Night time
Avg. Highest Time
9PM10th Aug

54AQI

Avg. Lowest Time
3AM11th Aug

25AQI

In the last 24 hours,

Chester's AQI reached its highest point of 54 at 9 PM during the Night, while the lowest point, 25, was recorded at 3 AM during the Night between 10th Aug and 11th Aug 2026.

Day & Night AQI Trend : Jul - Aug 2026

Chester, Pennsylvania, United States

JulAug
13th - 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
13th Jul 2026285 AMAQI
13th Jul 2026306 AMAQI
13th Jul 2026307 AMAQI
13th Jul 2026308 AMAQI
13th Jul 2026369 AMAQI
13th Jul 20263010 AMAQI
13th Jul 20262811 AMAQI
13th Jul 20262812 PMAQI
13th Jul 2026251 PMAQI
13th Jul 2026252 PMAQI
13th Jul 2026263 PMAQI
13th Jul 2026284 PMAQI
13th Jul 2026285 PMAQI
13th Jul 2026306 PMAQI
13th Jul 2026307 PMAQI
13th Jul 2026308 PMAQI
13th Jul 2026309 PMAQI
13th Jul 20262710 PMAQI
13th Jul 20262511 PMAQI
14th Jul 20262512 AMAQI
14th Jul 2026251 AMAQI
14th Jul 2026202 AMAQI
14th Jul 2026223 AMAQI
14th Jul 2026284 AMAQI

25°C19/32°C

14th Jul 2026285 AMAQI
14th Jul 2026286 AMAQI
14th Jul 2026297 AMAQI
14th Jul 2026288 AMAQI
14th Jul 2026319 AMAQI
14th Jul 20263010 AMAQI
14th Jul 20262911 AMAQI
14th Jul 20263012 PMAQI
14th Jul 2026301 PMAQI
14th Jul 2026322 PMAQI
14th Jul 2026263 PMAQI
14th Jul 2026314 PMAQI
14th Jul 2026265 PMAQI
14th Jul 2026306 PMAQI
14th Jul 2026307 PMAQI
14th Jul 2026308 PMAQI
14th Jul 2026329 PMAQI
14th Jul 20262610 PMAQI
14th Jul 20262411 PMAQI
15th Jul 20262112 AMAQI
15th Jul 2026231 AMAQI
15th Jul 2026292 AMAQI
15th Jul 2026293 AMAQI
15th Jul 2026314 AMAQI

27°C19/35°C

15th Jul 2026245 AMAQI
15th Jul 2026226 AMAQI
15th Jul 2026287 AMAQI
15th Jul 2026248 AMAQI
15th Jul 2026319 AMAQI
15th Jul 20262810 AMAQI
15th Jul 20262811 AMAQI
15th Jul 20262812 PMAQI
15th Jul 2026331 PMAQI
15th Jul 2026342 PMAQI
15th Jul 2026473 PMAQI
15th Jul 2026324 PMAQI
15th Jul 2026325 PMAQI
15th Jul 2026326 PMAQI
15th Jul 2026347 PMAQI
15th Jul 2026328 PMAQI
15th Jul 2026569 PMAQI
15th Jul 20263610 PMAQI
15th Jul 20264411 PMAQI
16th Jul 20266012 AMAQI
16th Jul 2026821 AMAQI
16th Jul 20261012 AMAQI
16th Jul 2026543 AMAQI
16th Jul 2026544 AMAQI

31°C23/41°C

16th Jul 20261045 AMAQI
16th Jul 20261066 AMAQI
16th Jul 20261047 AMAQI
16th Jul 20261038 AMAQI
16th Jul 2026569 AMAQI
16th Jul 20269210 AMAQI
16th Jul 202610611 AMAQI
16th Jul 20266012 PMAQI
16th Jul 20261141 PMAQI
16th Jul 2026622 PMAQI
16th Jul 20261003 PMAQI
16th Jul 2026784 PMAQI
16th Jul 2026555 PMAQI
16th Jul 2026516 PMAQI
16th Jul 2026637 PMAQI
16th Jul 2026718 PMAQI
16th Jul 2026749 PMAQI
16th Jul 202612810 PMAQI
16th Jul 202613011 PMAQI
17th Jul 202613512 AMAQI
17th Jul 20261561 AMAQI
17th Jul 20261552 AMAQI
17th Jul 20261963 AMAQI
17th Jul 20261964 AMAQI

30°C25/37°C

17th Jul 20262295 AMAQI
17th Jul 20262406 AMAQI
17th Jul 20262347 AMAQI
17th Jul 20262128 AMAQI
17th Jul 20262109 AMAQI
17th Jul 202619010 AMAQI
17th Jul 202618511 AMAQI
17th Jul 202617712 PMAQI
17th Jul 20261701 PMAQI
17th Jul 20261722 PMAQI
17th Jul 20261723 PMAQI
17th Jul 20261714 PMAQI
17th Jul 20261705 PMAQI
17th Jul 20261706 PMAQI
17th Jul 20261727 PMAQI
17th Jul 20261748 PMAQI
17th Jul 20261769 PMAQI
17th Jul 202617610 PMAQI
17th Jul 202617611 PMAQI
18th Jul 202617612 AMAQI
18th Jul 20261781 AMAQI
18th Jul 20261742 AMAQI
18th Jul 20261763 AMAQI
18th Jul 20261764 AMAQI

28°C22/35°C

18th Jul 20261745 AMAQI
18th Jul 20261706 AMAQI
18th Jul 20261707 AMAQI
18th Jul 20261708 AMAQI
18th Jul 20261689 AMAQI
18th Jul 202617010 AMAQI
18th Jul 202616611 AMAQI
18th Jul 202615612 PMAQI
18th Jul 20261561 PMAQI
18th Jul 20261582 PMAQI
18th Jul 20261553 PMAQI
18th Jul 20261474 PMAQI
18th Jul 20261345 PMAQI
18th Jul 20261276 PMAQI
18th Jul 20261067 PMAQI
18th Jul 2026828 PMAQI
18th Jul 2026679 PMAQI
18th Jul 20265810 PMAQI
18th Jul 20265311 PMAQI
19th Jul 20265212 AMAQI
19th Jul 2026461 AMAQI
19th Jul 2026442 AMAQI
19th Jul 2026423 AMAQI
19th Jul 2026444 AMAQI

25°C21/33°C

19th Jul 2026295 AMAQI
19th Jul 2026376 AMAQI
19th Jul 2026527 AMAQI
19th Jul 2026428 AMAQI
19th Jul 2026509 AMAQI
19th Jul 20265510 AMAQI
19th Jul 20266811 AMAQI
19th Jul 20267012 PMAQI
19th Jul 2026721 PMAQI
19th Jul 2026702 PMAQI
19th Jul 2026723 PMAQI
19th Jul 2026674 PMAQI
19th Jul 2026665 PMAQI
19th Jul 2026666 PMAQI
19th Jul 2026657 PMAQI
19th Jul 2026668 PMAQI
19th Jul 2026649 PMAQI
19th Jul 20266610 PMAQI
19th Jul 20266311 PMAQI
20th Jul 20265612 AMAQI
20th Jul 2026571 AMAQI
20th Jul 2026532 AMAQI
20th Jul 2026543 AMAQI
20th Jul 2026524 AMAQI

25°C21/32°C

20th Jul 2026425 AMAQI
20th Jul 2026406 AMAQI
20th Jul 2026427 AMAQI
20th Jul 2026408 AMAQI
20th Jul 2026489 AMAQI
20th Jul 20264710 AMAQI
20th Jul 20263411 AMAQI
20th Jul 20264212 PMAQI
20th Jul 2026301 PMAQI
20th Jul 2026382 PMAQI
20th Jul 2026313 PMAQI
20th Jul 2026484 PMAQI
20th Jul 2026505 PMAQI
20th Jul 2026516 PMAQI
20th Jul 2026547 PMAQI
20th Jul 2026558 PMAQI
20th Jul 2026599 PMAQI
20th Jul 20265610 PMAQI
21st Jul 20265512 AMAQI
21st Jul 2026571 AMAQI
21st Jul 2026602 AMAQI
21st Jul 2026603 AMAQI
21st Jul 2026594 AMAQI

24°C16/32°C

21st Jul 2026625 AMAQI
21st Jul 2026596 AMAQI
21st Jul 2026607 AMAQI
21st Jul 2026598 AMAQI
21st Jul 2026579 AMAQI
21st Jul 20265810 AMAQI
21st Jul 20265311 AMAQI
21st Jul 20264812 PMAQI
21st Jul 2026481 PMAQI
21st Jul 2026442 PMAQI
21st Jul 2026423 PMAQI
21st Jul 2026444 PMAQI
21st Jul 2026505 PMAQI
21st Jul 2026486 PMAQI
21st Jul 2026447 PMAQI
21st Jul 2026428 PMAQI
21st Jul 2026259 PMAQI
21st Jul 20264610 PMAQI
21st Jul 20262511 PMAQI
22nd Jul 20263312 AMAQI
22nd Jul 2026361 AMAQI
22nd Jul 2026452 AMAQI
22nd Jul 2026383 AMAQI
22nd Jul 2026384 AMAQI

26°C22/33°C

22nd Jul 2026375 AMAQI
22nd Jul 2026336 AMAQI
22nd Jul 2026387 AMAQI
22nd Jul 2026468 AMAQI
22nd Jul 2026479 AMAQI
22nd Jul 20263010 AMAQI
22nd Jul 20264511 AMAQI
22nd Jul 20262112 PMAQI
22nd Jul 2026441 PMAQI
22nd Jul 2026502 PMAQI
22nd Jul 2026463 PMAQI
22nd Jul 2026444 PMAQI
22nd Jul 2026425 PMAQI
22nd Jul 2026466 PMAQI
22nd Jul 2026487 PMAQI
22nd Jul 2026468 PMAQI
22nd Jul 2026449 PMAQI
22nd Jul 20264410 PMAQI
22nd Jul 20264611 PMAQI
23rd Jul 20264012 AMAQI
23rd Jul 2026251 AMAQI
23rd Jul 2026422 AMAQI
23rd Jul 2026423 AMAQI
23rd Jul 2026364 AMAQI

26°C22/31°C

23rd Jul 2026255 AMAQI
23rd Jul 2026256 AMAQI
23rd Jul 2026257 AMAQI
23rd Jul 2026298 AMAQI
23rd Jul 2026339 AMAQI
23rd Jul 20263910 AMAQI
23rd Jul 20263811 AMAQI
23rd Jul 20264812 PMAQI
23rd Jul 2026271 PMAQI
23rd Jul 2026372 PMAQI
23rd Jul 2026383 PMAQI
23rd Jul 2026414 PMAQI
23rd Jul 2026355 PMAQI
23rd Jul 2026346 PMAQI
23rd Jul 2026427 PMAQI
23rd Jul 2026368 PMAQI
23rd Jul 2026299 PMAQI
23rd Jul 20263810 PMAQI
23rd Jul 20264311 PMAQI
24th Jul 20263612 AMAQI
24th Jul 2026251 AMAQI
24th Jul 2026252 AMAQI
24th Jul 2026363 AMAQI
24th Jul 2026364 AMAQI

24°C18/30°C

24th Jul 2026415 AMAQI
24th Jul 2026426 AMAQI
24th Jul 2026257 AMAQI
24th Jul 2026258 AMAQI
24th Jul 2026339 AMAQI
24th Jul 20263810 AMAQI
24th Jul 20265411 AMAQI
24th Jul 20263312 PMAQI
24th Jul 2026251 PMAQI
24th Jul 2026292 PMAQI
24th Jul 2026443 PMAQI
24th Jul 2026294 PMAQI
24th Jul 2026345 PMAQI
24th Jul 2026256 PMAQI
24th Jul 2026297 PMAQI
24th Jul 2026258 PMAQI
24th Jul 2026299 PMAQI
24th Jul 20263810 PMAQI
24th Jul 20263311 PMAQI
25th Jul 20263412 AMAQI
25th Jul 2026291 AMAQI
25th Jul 2026232 AMAQI
25th Jul 2026293 AMAQI
25th Jul 2026294 AMAQI

24°C17/31°C

25th Jul 2026365 AMAQI
25th Jul 2026426 AMAQI
25th Jul 2026407 AMAQI
25th Jul 2026208 AMAQI
25th Jul 2026279 AMAQI
25th Jul 20263410 AMAQI
25th Jul 20263311 AMAQI
25th Jul 20262912 PMAQI
25th Jul 2026481 PMAQI
25th Jul 2026402 PMAQI
25th Jul 2026213 PMAQI
25th Jul 2026164 PMAQI
25th Jul 2026215 PMAQI
25th Jul 2026186 PMAQI
25th Jul 2026277 PMAQI
25th Jul 2026428 PMAQI
25th Jul 2026259 PMAQI
25th Jul 20262510 PMAQI
25th Jul 20263311 PMAQI
26th Jul 20262912 AMAQI
26th Jul 2026311 AMAQI
26th Jul 2026292 AMAQI
26th Jul 2026363 AMAQI
26th Jul 2026274 AMAQI

24°C18/31°C

26th Jul 2026365 AMAQI
26th Jul 2026296 AMAQI
26th Jul 2026387 AMAQI
26th Jul 2026388 AMAQI
26th Jul 2026429 AMAQI
26th Jul 20264210 AMAQI
26th Jul 20262211 AMAQI
26th Jul 20263112 PMAQI
26th Jul 2026401 PMAQI
26th Jul 2026422 PMAQI
26th Jul 2026443 PMAQI
26th Jul 2026484 PMAQI
26th Jul 2026445 PMAQI
26th Jul 2026466 PMAQI
26th Jul 2026487 PMAQI
26th Jul 2026488 PMAQI
26th Jul 2026469 PMAQI
26th Jul 20264410 PMAQI
26th Jul 20264611 PMAQI
27th Jul 20264412 AMAQI
27th Jul 2026441 AMAQI
27th Jul 2026422 AMAQI
27th Jul 2026443 AMAQI
27th Jul 2026444 AMAQI

24°C17/32°C

27th Jul 2026425 AMAQI
27th Jul 2026426 AMAQI
27th Jul 2026427 AMAQI
27th Jul 2026428 AMAQI
27th Jul 2026469 AMAQI
27th Jul 20264610 AMAQI
27th Jul 20264611 AMAQI
27th Jul 20264612 PMAQI
27th Jul 2026481 PMAQI
27th Jul 2026482 PMAQI
27th Jul 2026483 PMAQI
27th Jul 2026504 PMAQI
27th Jul 2026515 PMAQI
27th Jul 2026486 PMAQI
27th Jul 2026537 PMAQI
27th Jul 2026508 PMAQI
27th Jul 2026509 PMAQI
27th Jul 20264810 PMAQI
27th Jul 20264811 PMAQI
28th Jul 20264612 AMAQI
28th Jul 2026521 AMAQI
28th Jul 2026502 AMAQI
28th Jul 2026503 AMAQI
28th Jul 2026514 AMAQI

26°C21/32°C

28th Jul 2026485 AMAQI
28th Jul 2026486 AMAQI
28th Jul 2026487 AMAQI
28th Jul 2026508 AMAQI
28th Jul 2026509 AMAQI
28th Jul 20265010 AMAQI
28th Jul 20264811 AMAQI
28th Jul 20264912 PMAQI
28th Jul 2026501 PMAQI
28th Jul 2026542 PMAQI
28th Jul 2026513 PMAQI
28th Jul 2026544 PMAQI
28th Jul 2026555 PMAQI
28th Jul 2026526 PMAQI
28th Jul 2026527 PMAQI
28th Jul 2026508 PMAQI
28th Jul 2026519 PMAQI
28th Jul 20264610 PMAQI
28th Jul 20264611 PMAQI
29th Jul 20263612 AMAQI
29th Jul 2026511 AMAQI
29th Jul 2026332 AMAQI
29th Jul 2026363 AMAQI
29th Jul 2026344 AMAQI

24°C21/30°C

29th Jul 2026405 AMAQI
29th Jul 2026446 AMAQI
29th Jul 2026467 AMAQI
29th Jul 2026468 AMAQI
29th Jul 2026469 AMAQI
29th Jul 20264610 AMAQI
29th Jul 20264611 AMAQI
29th Jul 20264612 PMAQI
29th Jul 2026441 PMAQI
29th Jul 2026422 PMAQI
29th Jul 2026403 PMAQI
29th Jul 2026424 PMAQI
29th Jul 2026455 PMAQI
29th Jul 2026306 PMAQI
29th Jul 2026317 PMAQI
29th Jul 2026218 PMAQI
29th Jul 2026209 PMAQI
29th Jul 20262110 PMAQI
29th Jul 20263411 PMAQI
30th Jul 20262112 AMAQI
30th Jul 2026281 AMAQI
30th Jul 2026212 AMAQI
30th Jul 2026203 AMAQI
30th Jul 2026204 AMAQI

24°C19/31°C

30th Jul 2026255 AMAQI
30th Jul 2026186 AMAQI
30th Jul 2026237 AMAQI
30th Jul 2026208 AMAQI
30th Jul 2026299 AMAQI
30th Jul 20262910 AMAQI
30th Jul 20263611 AMAQI
30th Jul 20262512 PMAQI
30th Jul 2026211 PMAQI
30th Jul 2026102 PMAQI
30th Jul 2026363 PMAQI
30th Jul 2026254 PMAQI
30th Jul 2026185 PMAQI
30th Jul 2026126 PMAQI
30th Jul 2026187 PMAQI
30th Jul 2026178 PMAQI
30th Jul 2026169 PMAQI
30th Jul 20262110 PMAQI
30th Jul 20262511 PMAQI
31st Jul 20262512 AMAQI
31st Jul 2026191 AMAQI
31st Jul 2026192 AMAQI
31st Jul 2026223 AMAQI
31st Jul 2026254 AMAQI

24°C19/29°C

31st Jul 2026185 AMAQI
31st Jul 2026296 AMAQI
31st Jul 2026227 AMAQI
31st Jul 2026258 AMAQI
31st Jul 2026239 AMAQI
31st Jul 20263410 AMAQI
31st Jul 20262911 AMAQI
31st Jul 20264612 PMAQI
31st Jul 2026501 PMAQI
31st Jul 2026512 PMAQI
31st Jul 2026403 PMAQI
31st Jul 2026464 PMAQI
31st Jul 2026445 PMAQI
31st Jul 2026426 PMAQI
31st Jul 2026447 PMAQI
31st Jul 2026468 PMAQI
31st Jul 2026489 PMAQI
31st Jul 20264810 PMAQI
31st Jul 20264811 PMAQI
1st Aug 20265112 AMAQI
1st Aug 2026401 AMAQI
1st Aug 2026422 AMAQI
1st Aug 2026303 AMAQI
1st Aug 2026364 AMAQI

26°C20/34°C

1st Aug 2026345 AMAQI
1st Aug 2026326 AMAQI
1st Aug 2026347 AMAQI
1st Aug 2026368 AMAQI
1st Aug 2026429 AMAQI
1st Aug 20264210 AMAQI
1st Aug 20264011 AMAQI
1st Aug 20264412 PMAQI
1st Aug 2026421 PMAQI
1st Aug 2026442 PMAQI
1st Aug 2026443 PMAQI
1st Aug 2026464 PMAQI
1st Aug 2026485 PMAQI
1st Aug 2026486 PMAQI
1st Aug 2026427 PMAQI
1st Aug 2026468 PMAQI
1st Aug 2026469 PMAQI
1st Aug 20265210 PMAQI
1st Aug 20265011 PMAQI
2nd Aug 20264712 AMAQI
2nd Aug 2026501 AMAQI
2nd Aug 2026462 AMAQI
2nd Aug 2026423 AMAQI
2nd Aug 2026404 AMAQI

27°C21/33°C

2nd Aug 2026385 AMAQI
2nd Aug 2026406 AMAQI
2nd Aug 2026407 AMAQI
2nd Aug 2026348 AMAQI
2nd Aug 2026369 AMAQI
2nd Aug 20263810 AMAQI
2nd Aug 20262511 AMAQI
2nd Aug 20262812 PMAQI
2nd Aug 2026361 PMAQI
2nd Aug 2026322 PMAQI
2nd Aug 2026383 PMAQI
2nd Aug 2026324 PMAQI
2nd Aug 2026425 PMAQI
2nd Aug 2026466 PMAQI
2nd Aug 2026467 PMAQI
2nd Aug 2026428 PMAQI
2nd Aug 2026429 PMAQI
2nd Aug 20264410 PMAQI
2nd Aug 20264411 PMAQI
3rd Aug 20264412 AMAQI
3rd Aug 2026461 AMAQI
3rd Aug 2026442 AMAQI
3rd Aug 2026443 AMAQI
3rd Aug 2026464 AMAQI

27°C24/32°C

3rd Aug 2026425 AMAQI
3rd Aug 2026366 AMAQI
3rd Aug 2026337 AMAQI
3rd Aug 2026408 AMAQI
3rd Aug 2026369 AMAQI
3rd Aug 20264210 AMAQI
3rd Aug 20264211 AMAQI
3rd Aug 20264012 PMAQI
3rd Aug 2026381 PMAQI
3rd Aug 2026442 PMAQI
3rd Aug 2026443 PMAQI
3rd Aug 2026444 PMAQI
3rd Aug 2026185 PMAQI
3rd Aug 2026366 PMAQI
3rd Aug 2026327 PMAQI
3rd Aug 2026348 PMAQI
3rd Aug 2026369 PMAQI
3rd Aug 20264710 PMAQI
3rd Aug 20263111 PMAQI
4th Aug 20262312 AMAQI
4th Aug 2026321 AMAQI
4th Aug 2026382 AMAQI
4th Aug 2026363 AMAQI
4th Aug 2026244 AMAQI

27°C24/31°C

4th Aug 2026195 AMAQI
4th Aug 2026176 AMAQI
4th Aug 2026127 AMAQI
4th Aug 2026188 AMAQI
4th Aug 2026209 AMAQI
4th Aug 20262110 AMAQI
4th Aug 20263611 AMAQI
4th Aug 20261812 PMAQI
4th Aug 2026201 PMAQI
4th Aug 2026302 PMAQI
4th Aug 2026463 PMAQI
4th Aug 2026384 PMAQI
4th Aug 2026345 PMAQI
4th Aug 2026336 PMAQI
4th Aug 2026337 PMAQI
4th Aug 2026138 PMAQI
4th Aug 2026139 PMAQI
4th Aug 20261910 PMAQI
4th Aug 20263711 PMAQI
5th Aug 20263312 AMAQI
5th Aug 2026421 AMAQI
5th Aug 2026322 AMAQI
5th Aug 2026243 AMAQI
5th Aug 2026294 AMAQI

25°C19/34°C

5th Aug 2026335 AMAQI
5th Aug 2026466 AMAQI
5th Aug 2026387 AMAQI
5th Aug 2026338 AMAQI
5th Aug 2026429 AMAQI
5th Aug 20262710 AMAQI
5th Aug 20262711 AMAQI
5th Aug 20261612 PMAQI
5th Aug 2026421 PMAQI
5th Aug 2026102 PMAQI
5th Aug 2026423 PMAQI
5th Aug 2026444 PMAQI
5th Aug 2026335 PMAQI
5th Aug 2026306 PMAQI
5th Aug 2026267 PMAQI
5th Aug 2026108 PMAQI
5th Aug 2026259 PMAQI
5th Aug 20261610 PMAQI
5th Aug 20261011 PMAQI
6th Aug 20261612 AMAQI
6th Aug 2026321 AMAQI
6th Aug 2026442 AMAQI
6th Aug 2026463 AMAQI
6th Aug 2026444 AMAQI

25°C21/31°C

6th Aug 2026485 AMAQI
6th Aug 2026506 AMAQI
6th Aug 2026467 AMAQI
6th Aug 2026428 AMAQI
6th Aug 2026469 AMAQI
6th Aug 20264610 AMAQI
6th Aug 20265211 AMAQI
6th Aug 20265112 PMAQI
6th Aug 2026501 PMAQI
6th Aug 2026502 PMAQI
6th Aug 2026533 PMAQI
6th Aug 2026514 PMAQI
6th Aug 2026525 PMAQI
6th Aug 2026516 PMAQI
6th Aug 2026467 PMAQI
6th Aug 2026488 PMAQI
6th Aug 2026509 PMAQI
6th Aug 20264810 PMAQI
6th Aug 20265111 PMAQI
7th Aug 20264812 AMAQI
7th Aug 2026421 AMAQI
7th Aug 2026502 AMAQI
7th Aug 2026423 AMAQI
7th Aug 2026464 AMAQI

29°C24/36°C

7th Aug 2026485 AMAQI
7th Aug 2026446 AMAQI
7th Aug 2026257 AMAQI
7th Aug 2026218 AMAQI
7th Aug 2026239 AMAQI
7th Aug 20263610 AMAQI
7th Aug 20264011 AMAQI
7th Aug 20265012 PMAQI
7th Aug 2026461 PMAQI
7th Aug 2026462 PMAQI
7th Aug 2026463 PMAQI
7th Aug 2026424 PMAQI
7th Aug 2026445 PMAQI
7th Aug 2026526 PMAQI
7th Aug 2026487 PMAQI
7th Aug 2026528 PMAQI
7th Aug 2026469 PMAQI
7th Aug 20263710 PMAQI
7th Aug 20263811 PMAQI
8th Aug 20263612 AMAQI
8th Aug 2026331 AMAQI
8th Aug 2026382 AMAQI
8th Aug 2026293 AMAQI
8th Aug 2026334 AMAQI

29°C24/36°C

8th Aug 2026255 AMAQI
8th Aug 2026256 AMAQI
8th Aug 2026257 AMAQI
8th Aug 2026338 AMAQI
8th Aug 2026389 AMAQI
8th Aug 20262910 AMAQI
8th Aug 20262511 AMAQI
8th Aug 20262912 PMAQI
8th Aug 2026421 PMAQI
8th Aug 2026462 PMAQI
8th Aug 2026463 PMAQI
8th Aug 2026504 PMAQI
8th Aug 2026495 PMAQI
8th Aug 2026536 PMAQI
8th Aug 2026347 PMAQI
8th Aug 2026328 PMAQI
8th Aug 2026349 PMAQI
8th Aug 20263810 PMAQI
8th Aug 20263811 PMAQI
9th Aug 20264012 AMAQI
9th Aug 2026421 AMAQI
9th Aug 2026422 AMAQI
9th Aug 2026403 AMAQI
9th Aug 2026404 AMAQI

27°C23/33°C

9th Aug 2026405 AMAQI
9th Aug 2026406 AMAQI
9th Aug 2026407 AMAQI
9th Aug 2026468 AMAQI
9th Aug 2026489 AMAQI
9th Aug 20264810 AMAQI
9th Aug 20264611 AMAQI
9th Aug 20265112 PMAQI
9th Aug 2026531 PMAQI
9th Aug 2026522 PMAQI
9th Aug 2026523 PMAQI
9th Aug 2026544 PMAQI
9th Aug 2026535 PMAQI
9th Aug 2026566 PMAQI
9th Aug 2026567 PMAQI
9th Aug 2026548 PMAQI
9th Aug 2026529 PMAQI
9th Aug 20265410 PMAQI
9th Aug 20265311 PMAQI
10th Aug 20265512 AMAQI
10th Aug 2026531 AMAQI
10th Aug 2026512 AMAQI
10th Aug 2026503 AMAQI
10th Aug 2026524 AMAQI

29°C23/35°C

10th Aug 2026515 AMAQI
10th Aug 2026516 AMAQI
10th Aug 2026507 AMAQI
10th Aug 2026498 AMAQI
10th Aug 2026489 AMAQI
10th Aug 20264810 AMAQI
10th Aug 20265211 AMAQI
10th Aug 20264912 PMAQI
10th Aug 2026511 PMAQI
10th Aug 2026522 PMAQI
10th Aug 2026483 PMAQI
10th Aug 2026464 PMAQI
10th Aug 2026465 PMAQI
10th Aug 2026446 PMAQI
10th Aug 2026537 PMAQI
10th Aug 2026538 PMAQI
10th Aug 2026549 PMAQI
10th Aug 20265310 PMAQI
10th Aug 20265111 PMAQI
11th Aug 20264812 AMAQI
11th Aug 2026441 AMAQI
11th Aug 2026332 AMAQI
11th Aug 2026253 AMAQI
11th Aug 2026324 AMAQI

27°C22/35°C

11th Aug 2026445 AMAQI
5 AM
11th Aug 2026466 AMAQI
11th Aug 2026427 AMAQI
11th Aug 2026448 AMAQI
11th Aug 2026509 AMAQI
11th Aug 20265110 AMAQI
11th Aug 20265211 AMAQI
11th Aug 20265212 PMAQI
12 PM
11th Aug 2026531 PMAQI
11th Aug 2026572 PMAQI
11th Aug 2026583 PMAQI
11th Aug 2026604 PMAQI
11th Aug 2026605 PMAQI
11th Aug 2026636 PMAQI
11th Aug 2026627 PMAQI
11th Aug 2026628 PMAQI
8 PM
11th Aug 2026629 PMAQI
11th Aug 20266310 PMAQI
11th Aug 20266411 PMAQI
12 AM
4 AM

27°C22/33°C

Day time
Avg. Highest Time
3 PM - 4 PM

53AQI

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

47AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 3 PM to 4 PM (Avg. 53), while the lowest AQI was between 8 PM to 8 PM (Avg. 47).
Night time
Avg. Highest Time
10 PM - 11 PM

49AQI

2 hours / Day
60 hours / Month
Avg. Lowest Time
12 AM

46AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 10 PM to 11 PM (Avg. 49), while the lowest AQI was between 12 AM to 12 AM (Avg. 46).

2026 Days Vs Air Quality

Chester, Pennsylvania, United States

2026

92%

203

7%

15

0.4%

1

0.4%

1

Total number of days with different AQI categories in last 223 days in 2026 (142 days remaining)

Good
203 Days
Moderate
15 Days
Poor
1 Days
Unhealthy
1 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 92%

Health Risk Level:

Very Low

In 2026, 92% of 223 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.

Annual Air Quality Insights

Chester, Pennsylvania, United States

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
18AQI (US)
2nd January 2026
26AQI (US)
3rd January 2026
49AQI (US)
4th January 2026
57AQI (US)
5th January 2026
46AQI (US)
6th January 2026
67AQI (US)
7th January 2026
66AQI (US)
8th January 2026
40AQI (US)
9th January 2026
54AQI (US)
10th January 2026
40AQI (US)
11th January 2026
22AQI (US)
12th January 2026
21AQI (US)
13th January 2026
36AQI (US)
14th January 2026
38AQI (US)
15th January 2026
34AQI (US)
16th January 2026
19AQI (US)
17th January 2026
33AQI (US)
18th January 2026
84AQI (US)
19th January 2026
36AQI (US)
20th January 2026
24AQI (US)
21st January 2026
38AQI (US)
22nd January 2026
49AQI (US)
23rd January 2026
54AQI (US)
24th January 2026
48AQI (US)
25th January 2026
49AQI (US)
26th January 2026
48AQI (US)
27th January 2026
44AQI (US)
28th January 2026
49AQI (US)
29th January 2026
57AQI (US)
30th January 2026
55AQI (US)
31st January 2026
46AQI (US)
1st February 2026
46AQI (US)
2nd February 2026
51AQI (US)
3rd February 2026
49AQI (US)
4th February 2026
50AQI (US)
5th February 2026
48AQI (US)
6th February 2026
44AQI (US)
7th February 2026
42AQI (US)
8th February 2026
48AQI (US)
9th February 2026
49AQI (US)
10th February 2026
47AQI (US)
11th February 2026
44AQI (US)
12th February 2026
31AQI (US)
13th February 2026
33AQI (US)
14th February 2026
45AQI (US)
15th February 2026
47AQI (US)
16th February 2026
33AQI (US)
17th February 2026
66AQI (US)
18th February 2026
60AQI (US)
19th February 2026
40AQI (US)
20th February 2026
43AQI (US)
21st February 2026
43AQI (US)
22nd February 2026
37AQI (US)
23rd February 2026
41AQI (US)
24th February 2026
32AQI (US)
25th February 2026
37AQI (US)
26th February 2026
29AQI (US)
27th February 2026
24AQI (US)
28th February 2026
23AQI (US)
1st March 2026
36AQI (US)
2nd March 2026
49AQI (US)
3rd March 2026
44AQI (US)
4th March 2026
29AQI (US)
5th March 2026
28AQI (US)
6th March 2026
32AQI (US)
7th March 2026
32AQI (US)
8th March 2026
29AQI (US)
9th March 2026
28AQI (US)
10th March 2026
21AQI (US)
11th March 2026
30AQI (US)
12th March 2026
36AQI (US)
13th March 2026
36AQI (US)
14th March 2026
35AQI (US)
15th March 2026
33AQI (US)
16th March 2026
34AQI (US)
17th March 2026
37AQI (US)
18th March 2026
33AQI (US)
19th March 2026
25AQI (US)
20th March 2026
21AQI (US)
21st March 2026
26AQI (US)
22nd March 2026
21AQI (US)
23rd March 2026
32AQI (US)
24th March 2026
38AQI (US)
25th March 2026
27AQI (US)
26th March 2026
26AQI (US)
27th March 2026
30AQI (US)
28th March 2026
36AQI (US)
29th March 2026
26AQI (US)
30th March 2026
22AQI (US)
31st March 2026
17AQI (US)
1st April 2026
22AQI (US)
2nd April 2026
35AQI (US)
3rd April 2026
24AQI (US)
4th April 2026
21AQI (US)
5th April 2026
29AQI (US)
6th April 2026
29AQI (US)
7th April 2026
28AQI (US)
8th April 2026
40AQI (US)
9th April 2026
22AQI (US)
10th April 2026
22AQI (US)
11th April 2026
28AQI (US)
12th April 2026
30AQI (US)
13th April 2026
23AQI (US)
14th April 2026
22AQI (US)
15th April 2026
22AQI (US)
16th April 2026
22AQI (US)
17th April 2026
18th April 2026
36AQI (US)
19th April 2026
32AQI (US)
20th April 2026
23AQI (US)
21st April 2026
24AQI (US)
22nd April 2026
23rd April 2026
17AQI (US)
24th April 2026
15AQI (US)
25th April 2026
30AQI (US)
26th April 2026
35AQI (US)
27th April 2026
27AQI (US)
28th April 2026
25AQI (US)
29th April 2026
25AQI (US)
30th April 2026
27AQI (US)
1st May 2026
29AQI (US)
2nd May 2026
26AQI (US)
3rd May 2026
22AQI (US)
4th May 2026
24AQI (US)
5th May 2026
25AQI (US)
6th May 2026
26AQI (US)
7th May 2026
27AQI (US)
8th May 2026
28AQI (US)
9th May 2026
10th May 2026
23AQI (US)
11th May 2026
29AQI (US)
12th May 2026
35AQI (US)
13th May 2026
27AQI (US)
14th May 2026
30AQI (US)
15th May 2026
44AQI (US)
16th May 2026
44AQI (US)
17th May 2026
42AQI (US)
18th May 2026
47AQI (US)
19th May 2026
52AQI (US)
20th May 2026
45AQI (US)
21st May 2026
44AQI (US)
22nd May 2026
36AQI (US)
23rd May 2026
45AQI (US)
24th May 2026
47AQI (US)
25th May 2026
45AQI (US)
26th May 2026
29AQI (US)
27th May 2026
27AQI (US)
28th May 2026
23AQI (US)
29th May 2026
16AQI (US)
30th May 2026
20AQI (US)
31st May 2026
22AQI (US)
1st June 2026
25AQI (US)
2nd June 2026
23AQI (US)
3rd June 2026
18AQI (US)
4th June 2026
20AQI (US)
5th June 2026
29AQI (US)
6th June 2026
34AQI (US)
7th June 2026
20AQI (US)
8th June 2026
18AQI (US)
9th June 2026
18AQI (US)
10th June 2026
25AQI (US)
11th June 2026
26AQI (US)
12th June 2026
24AQI (US)
13th June 2026
19AQI (US)
14th June 2026
23AQI (US)
15th June 2026
21AQI (US)
16th June 2026
23AQI (US)
17th June 2026
22AQI (US)
18th June 2026
26AQI (US)
19th June 2026
22AQI (US)
20th June 2026
21AQI (US)
21st June 2026
18AQI (US)
22nd June 2026
25AQI (US)
23rd June 2026
18AQI (US)
24th June 2026
20AQI (US)
25th June 2026
21AQI (US)
26th June 2026
24AQI (US)
27th June 2026
28AQI (US)
28th June 2026
26AQI (US)
29th June 2026
25AQI (US)
30th June 2026
20AQI (US)
1st July 2026
29AQI (US)
2nd July 2026
50AQI (US)
3rd July 2026
50AQI (US)
4th July 2026
26AQI (US)
5th July 2026
30AQI (US)
6th July 2026
19AQI (US)
7th July 2026
14AQI (US)
8th July 2026
10AQI (US)
9th July 2026
18AQI (US)
10th July 2026
28AQI (US)
11th July 2026
27AQI (US)
12th July 2026
28AQI (US)
13th July 2026
28AQI (US)
14th July 2026
28AQI (US)
15th July 2026
32AQI (US)
16th July 2026
84AQI (US)
17th July 2026
184AQI (US)
18th July 2026
145AQI (US)
19th July 2026
57AQI (US)
20th July 2026
47AQI (US)
21st July 2026
50AQI (US)
22nd July 2026
41AQI (US)
23rd July 2026
35AQI (US)
24th July 2026
33AQI (US)
25th July 2026
30AQI (US)
26th July 2026
39AQI (US)
27th July 2026
46AQI (US)
28th July 2026
50AQI (US)
29th July 2026
38AQI (US)
30th July 2026
22AQI (US)
31st July 2026
35AQI (US)
1st August 2026
42AQI (US)
2nd August 2026
40AQI (US)
3rd August 2026
39AQI (US)
4th August 2026
26AQI (US)
5th August 2026
30AQI (US)
6th August 2026
46AQI (US)
7th August 2026
42AQI (US)
8th August 2026
36AQI (US)
9th August 2026
48AQI (US)
10th August 2026
50AQI (US)
11th August 2026
51AQI (US)
12th August 2026
13th August 2026
14th August 2026
15th August 2026
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
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

43AQI (US)

42AQI (US)

31AQI (US)

26AQI (US)

33AQI (US)

23AQI (US)

44AQI (US)

41AQI (US)

No. of days

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

202635AQI (US)

23
8
25
3
31
28
29
1
30
27
2
1
1
10
1
203
15
1
1

Highest AQI (US) recorded in

July

44AQI (US)

Lowest AQI (US) recorded in

June

23AQI (US)

202536AQI (US)

25
6
25
3
29
2
28
2
31
22
8
25
6
26
5
29
1
31
23
7
22
9
316
49

Highest AQI (US) recorded in

December

43AQI (US)

Lowest AQI (US) recorded in

October

27AQI (US)

202435AQI (US)

25
6
24
5
29
2
28
2
30
1
29
27
4
24
7
29
29
2
30
27
4
331
33

Highest AQI (US) recorded in

July

39AQI (US)

Lowest AQI (US) recorded in

November

29AQI (US)

202343AQI (US)

27
4
19
9
28
3
26
4
24
7
12
12
3
1
2
23
8
25
6
27
3
26
5
25
4
23
8
285
73
3
1
2

Highest AQI (US) recorded in

June

75AQI (US)

Lowest AQI (US) recorded in

October

35AQI (US)

202240AQI (US)

18
9
1
12
9
20
10
28
2
27
3
25
2
17
7
1
1
27
2
30
1
27
3
26
5
258
54
1

Highest AQI (US) recorded in

February

50AQI (US)

Lowest AQI (US) recorded in

September

33AQI (US)

202142AQI (US)

20
6
14
7
12
4
15
9
26
5
25
5
18
10
2
29
2
27
3
30
1
21
9
19
12
256
73
2

Highest AQI (US) recorded in

July

53AQI (US)

Lowest AQI (US) recorded in

September

35AQI (US)

202039AQI (US)

7
6
15
5
17
1
29
1
27
4
29
2
28
2
29
21
6
1
21
10
223
37
1

Highest AQI (US) recorded in

March

46AQI (US)

Lowest AQI (US) recorded in

September

32AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2023(Avg.)
43AQI (US)
Least Polluted Year Recorded
2024(Avg.)
35AQI (US)

Chester's annual 2026 AQI (US) (35) shows an average percentage change of -10.1% (improved AQI (US)) compared to previous years: 2020 (39), 2021 (42), 2022 (40), 2023 (43), 2024 (35), 2025 (36).