Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Eureka, California, 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

Eureka, California, United States

2021
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
25th Aug 2021
78AQI
Lowest AQI recorded on
13th Aug 2024
21AQI

Same Day Analysis (15th August ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 2nd highest AQI at 27 of Good air quality, showing improvement over 2021 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 15th Aug - 16th Aug 2025

Eureka, California, United States

AQI
Day
Night
.

6 AM15th Aug 2025

8 PM

5 AM16th Aug 2025

Day time
Avg. Highest Time
2PM15th Aug

39AQI

Avg. Lowest Time
7AM15th Aug

22AQI

Night time
Avg. Highest Time
9PM15th Aug

23AQI

Avg. Lowest Time
2AM16th Aug

18AQI

In the last 24 hours,

Eureka's AQI reached its highest point of 39 at 2 PM during the Day, while the lowest point, 18, was recorded at 2 AM during the Night between 15th Aug and 16th Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Eureka, California, United States

JulAug
17th - 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 - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th
Day
Night
17th Jul 2025266 AMAQI
17th Jul 2025267 AMAQI
17th Jul 2025248 AMAQI
17th Jul 2025259 AMAQI
17th Jul 20252710 AMAQI
17th Jul 20252811 AMAQI
17th Jul 20253012 PMAQI
17th Jul 2025301 PMAQI
17th Jul 2025322 PMAQI
17th Jul 2025353 PMAQI
17th Jul 2025414 PMAQI
17th Jul 2025385 PMAQI
17th Jul 2025386 PMAQI
17th Jul 2025307 PMAQI
17th Jul 2025298 PMAQI
17th Jul 2025319 PMAQI
17th Jul 20253010 PMAQI
17th Jul 20252911 PMAQI
18th Jul 20252812 AMAQI
18th Jul 2025271 AMAQI
18th Jul 2025272 AMAQI
18th Jul 2025263 AMAQI
18th Jul 2025224 AMAQI
18th Jul 2025215 AMAQI

13°C13/14°C

18th Jul 2025236 AMAQI
18th Jul 2025317 AMAQI
18th Jul 2025238 AMAQI
18th Jul 2025219 AMAQI
18th Jul 20252210 AMAQI
18th Jul 20252311 AMAQI
18th Jul 20252312 PMAQI
18th Jul 2025231 PMAQI
18th Jul 2025262 PMAQI
18th Jul 2025293 PMAQI
18th Jul 2025324 PMAQI
18th Jul 2025325 PMAQI
18th Jul 2025326 PMAQI
18th Jul 2025267 PMAQI
18th Jul 2025268 PMAQI
18th Jul 2025349 PMAQI
18th Jul 20253610 PMAQI
18th Jul 20253711 PMAQI
19th Jul 20253412 AMAQI
19th Jul 2025341 AMAQI
19th Jul 2025342 AMAQI
19th Jul 2025323 AMAQI
19th Jul 2025324 AMAQI
19th Jul 2025315 AMAQI

13°C11/17°C

19th Jul 2025306 AMAQI
19th Jul 2025337 AMAQI
19th Jul 2025318 AMAQI
19th Jul 2025329 AMAQI
19th Jul 20253210 AMAQI
19th Jul 20253211 AMAQI
19th Jul 20253212 PMAQI
19th Jul 2025311 PMAQI
19th Jul 2025332 PMAQI
19th Jul 2025333 PMAQI
19th Jul 2025344 PMAQI
19th Jul 2025365 PMAQI
19th Jul 2025366 PMAQI
19th Jul 2025367 PMAQI
19th Jul 2025348 PMAQI
19th Jul 2025259 PMAQI
19th Jul 20252810 PMAQI
19th Jul 20253311 PMAQI
20th Jul 20253312 AMAQI
20th Jul 2025341 AMAQI
20th Jul 2025342 AMAQI
20th Jul 2025363 AMAQI
20th Jul 2025264 AMAQI
20th Jul 2025295 AMAQI

13°C11/17°C

20th Jul 2025216 AMAQI
20th Jul 2025197 AMAQI
20th Jul 2025218 AMAQI
20th Jul 2025239 AMAQI
20th Jul 20252610 AMAQI
20th Jul 20252611 AMAQI
20th Jul 20253412 PMAQI
20th Jul 2025301 PMAQI
20th Jul 2025302 PMAQI
20th Jul 2025263 PMAQI
20th Jul 2025274 PMAQI
20th Jul 2025245 PMAQI
20th Jul 2025266 PMAQI
20th Jul 2025267 PMAQI
20th Jul 2025228 PMAQI
20th Jul 2025259 PMAQI
20th Jul 20252410 PMAQI
20th Jul 20252711 PMAQI
21st Jul 20253312 AMAQI
21st Jul 2025341 AMAQI
21st Jul 2025312 AMAQI
21st Jul 2025283 AMAQI
21st Jul 2025364 AMAQI
21st Jul 2025285 AMAQI

13°C12/16°C

21st Jul 2025296 AMAQI
21st Jul 2025287 AMAQI
21st Jul 2025318 AMAQI
21st Jul 2025349 AMAQI
21st Jul 20253310 AMAQI
21st Jul 20253511 AMAQI
21st Jul 20253512 PMAQI
21st Jul 2025401 PMAQI
21st Jul 2025402 PMAQI
21st Jul 2025373 PMAQI
21st Jul 2025354 PMAQI
21st Jul 2025365 PMAQI
21st Jul 2025366 PMAQI
21st Jul 2025327 PMAQI
21st Jul 2025318 PMAQI
21st Jul 2025259 PMAQI
21st Jul 20252710 PMAQI
21st Jul 20252811 PMAQI
22nd Jul 20252812 AMAQI
22nd Jul 2025271 AMAQI
22nd Jul 2025282 AMAQI
22nd Jul 2025293 AMAQI
22nd Jul 2025264 AMAQI
22nd Jul 2025245 AMAQI

14°C13/15°C

22nd Jul 2025216 AMAQI
22nd Jul 2025207 AMAQI
22nd Jul 2025208 AMAQI
22nd Jul 2025209 AMAQI
22nd Jul 20252010 AMAQI
22nd Jul 20252211 AMAQI
22nd Jul 20252112 PMAQI
22nd Jul 2025231 PMAQI
22nd Jul 2025272 PMAQI
22nd Jul 2025243 PMAQI
22nd Jul 2025244 PMAQI
22nd Jul 2025225 PMAQI
22nd Jul 2025246 PMAQI
22nd Jul 2025237 PMAQI
22nd Jul 2025248 PMAQI
22nd Jul 2025269 PMAQI
22nd Jul 20252510 PMAQI
22nd Jul 20252611 PMAQI
23rd Jul 20252612 AMAQI
23rd Jul 2025251 AMAQI
23rd Jul 2025272 AMAQI
23rd Jul 2025253 AMAQI
23rd Jul 2025234 AMAQI
23rd Jul 2025235 AMAQI

14°C12/15°C

23rd Jul 2025226 AMAQI
23rd Jul 2025177 AMAQI
23rd Jul 2025178 AMAQI
23rd Jul 2025189 AMAQI
23rd Jul 20252410 AMAQI
23rd Jul 20252311 AMAQI
23rd Jul 20252012 PMAQI
23rd Jul 2025221 PMAQI
23rd Jul 2025222 PMAQI
23rd Jul 2025243 PMAQI
23rd Jul 2025244 PMAQI
23rd Jul 2025225 PMAQI
23rd Jul 2025206 PMAQI
23rd Jul 2025227 PMAQI
23rd Jul 2025218 PMAQI
23rd Jul 2025229 PMAQI
23rd Jul 20252310 PMAQI
23rd Jul 20252211 PMAQI
24th Jul 20252212 AMAQI
24th Jul 2025211 AMAQI
24th Jul 2025162 AMAQI
24th Jul 2025163 AMAQI
24th Jul 2025144 AMAQI
24th Jul 2025175 AMAQI

14°C13/16°C

24th Jul 2025206 AMAQI
24th Jul 2025177 AMAQI
24th Jul 2025158 AMAQI
24th Jul 2025179 AMAQI
24th Jul 20252510 AMAQI
24th Jul 20252411 AMAQI
24th Jul 20252412 PMAQI
24th Jul 2025191 PMAQI
24th Jul 2025172 PMAQI
24th Jul 2025193 PMAQI
24th Jul 2025194 PMAQI
24th Jul 2025215 PMAQI
24th Jul 2025266 PMAQI
24th Jul 2025227 PMAQI
24th Jul 2025238 PMAQI
24th Jul 2025259 PMAQI
24th Jul 20252210 PMAQI
24th Jul 20252111 PMAQI
25th Jul 20252012 AMAQI
25th Jul 2025201 AMAQI
25th Jul 2025182 AMAQI
25th Jul 2025173 AMAQI
25th Jul 2025184 AMAQI
25th Jul 2025175 AMAQI

14°C13/15°C

25th Jul 2025186 AMAQI
25th Jul 2025177 AMAQI
25th Jul 2025168 AMAQI
25th Jul 2025179 AMAQI
25th Jul 20251910 AMAQI
25th Jul 20252211 AMAQI
25th Jul 20252812 PMAQI
25th Jul 2025271 PMAQI
25th Jul 2025232 PMAQI
25th Jul 2025243 PMAQI
25th Jul 2025264 PMAQI
25th Jul 2025275 PMAQI
25th Jul 2025266 PMAQI
25th Jul 2025187 PMAQI
25th Jul 2025208 PMAQI
25th Jul 2025269 PMAQI
25th Jul 20252210 PMAQI
25th Jul 20252011 PMAQI
26th Jul 20252012 AMAQI
26th Jul 2025211 AMAQI
26th Jul 2025202 AMAQI
26th Jul 2025223 AMAQI
26th Jul 2025184 AMAQI
26th Jul 2025165 AMAQI

14°C13/15°C

26th Jul 2025166 AMAQI
26th Jul 2025447 AMAQI
26th Jul 2025178 AMAQI
26th Jul 2025169 AMAQI
26th Jul 20251510 AMAQI
26th Jul 20251411 AMAQI
26th Jul 20251612 PMAQI
26th Jul 2025191 PMAQI
26th Jul 2025182 PMAQI
26th Jul 2025213 PMAQI
26th Jul 2025224 PMAQI
26th Jul 2025215 PMAQI
26th Jul 2025206 PMAQI
26th Jul 2025197 PMAQI
26th Jul 2025198 PMAQI
26th Jul 2025209 PMAQI
26th Jul 20252010 PMAQI
26th Jul 20251911 PMAQI
27th Jul 20252012 AMAQI
27th Jul 2025231 AMAQI
27th Jul 2025232 AMAQI
27th Jul 2025203 AMAQI
27th Jul 2025204 AMAQI
27th Jul 2025225 AMAQI

14°C13/16°C

27th Jul 2025246 AMAQI
27th Jul 2025197 AMAQI
27th Jul 2025208 AMAQI
27th Jul 2025199 AMAQI
27th Jul 20252010 AMAQI
27th Jul 20251911 AMAQI
27th Jul 20252012 PMAQI
27th Jul 2025181 PMAQI
27th Jul 2025192 PMAQI
27th Jul 2025203 PMAQI
27th Jul 2025204 PMAQI
27th Jul 2025235 PMAQI
27th Jul 2025226 PMAQI
27th Jul 2025217 PMAQI
27th Jul 2025208 PMAQI
27th Jul 2025229 PMAQI
27th Jul 20252210 PMAQI
27th Jul 20252211 PMAQI
28th Jul 20252412 AMAQI
28th Jul 2025251 AMAQI
28th Jul 2025242 AMAQI
28th Jul 2025233 AMAQI
28th Jul 2025244 AMAQI
28th Jul 2025225 AMAQI

14°C12/16°C

28th Jul 2025226 AMAQI
28th Jul 2025237 AMAQI
28th Jul 2025238 AMAQI
28th Jul 2025229 AMAQI
28th Jul 20252210 AMAQI
28th Jul 20252811 AMAQI
28th Jul 20253012 PMAQI
28th Jul 2025381 PMAQI
28th Jul 2025392 PMAQI
28th Jul 2025333 PMAQI
28th Jul 2025374 PMAQI
28th Jul 2025315 PMAQI
28th Jul 2025326 PMAQI
28th Jul 2025267 PMAQI
28th Jul 2025268 PMAQI
28th Jul 2025299 PMAQI
28th Jul 20252810 PMAQI
28th Jul 20252811 PMAQI
29th Jul 20252812 AMAQI
29th Jul 2025321 AMAQI
29th Jul 2025252 AMAQI
29th Jul 2025263 AMAQI
29th Jul 2025224 AMAQI
29th Jul 2025255 AMAQI

14°C11/16°C

29th Jul 2025276 AMAQI
29th Jul 2025267 AMAQI
29th Jul 2025238 AMAQI
29th Jul 2025269 AMAQI
29th Jul 20252610 AMAQI
29th Jul 20252711 AMAQI
29th Jul 20253412 PMAQI
29th Jul 2025351 PMAQI
29th Jul 2025302 PMAQI
29th Jul 2025283 PMAQI
29th Jul 2025284 PMAQI
29th Jul 2025285 PMAQI
29th Jul 2025296 PMAQI
29th Jul 2025297 PMAQI
29th Jul 2025288 PMAQI
29th Jul 2025279 PMAQI
29th Jul 20252910 PMAQI
29th Jul 20253011 PMAQI
30th Jul 20253012 AMAQI
30th Jul 2025301 AMAQI
30th Jul 2025302 AMAQI
30th Jul 2025283 AMAQI
30th Jul 2025284 AMAQI
30th Jul 2025305 AMAQI

14°C12/15°C

30th Jul 2025296 AMAQI
30th Jul 2025287 AMAQI
30th Jul 2025288 AMAQI
30th Jul 2025289 AMAQI
30th Jul 20252610 AMAQI
30th Jul 20252911 AMAQI
30th Jul 20253012 PMAQI
30th Jul 2025281 PMAQI
30th Jul 2025292 PMAQI
30th Jul 2025293 PMAQI
30th Jul 2025294 PMAQI
30th Jul 2025295 PMAQI
30th Jul 2025296 PMAQI
30th Jul 2025297 PMAQI
30th Jul 2025298 PMAQI
30th Jul 2025309 PMAQI
30th Jul 20253210 PMAQI
30th Jul 20253111 PMAQI
31st Jul 20252812 AMAQI
31st Jul 2025281 AMAQI
31st Jul 2025242 AMAQI
31st Jul 2025263 AMAQI
31st Jul 2025244 AMAQI
31st Jul 2025235 AMAQI

14°C13/16°C

31st Jul 2025296 AMAQI
31st Jul 2025297 AMAQI
31st Jul 2025328 AMAQI
31st Jul 2025459 AMAQI
31st Jul 20252110 AMAQI
31st Jul 20252411 AMAQI
31st Jul 20252212 PMAQI
31st Jul 2025221 PMAQI
31st Jul 2025312 PMAQI
31st Jul 2025253 PMAQI
31st Jul 2025274 PMAQI
31st Jul 2025265 PMAQI
31st Jul 2025236 PMAQI
31st Jul 2025227 PMAQI
31st Jul 2025258 PMAQI
31st Jul 2025269 PMAQI
31st Jul 20252610 PMAQI
31st Jul 20252411 PMAQI
1st Aug 20252412 AMAQI
1st Aug 2025241 AMAQI
1st Aug 2025242 AMAQI
1st Aug 2025233 AMAQI
1st Aug 2025204 AMAQI
1st Aug 2025225 AMAQI

14°C13/16°C

1st Aug 2025206 AMAQI
1st Aug 2025187 AMAQI
1st Aug 2025208 AMAQI
1st Aug 2025209 AMAQI
1st Aug 20252110 AMAQI
1st Aug 20252511 AMAQI
1st Aug 20252212 PMAQI
1st Aug 2025191 PMAQI
1st Aug 2025212 PMAQI
1st Aug 2025213 PMAQI
1st Aug 2025244 PMAQI
1st Aug 2025285 PMAQI
1st Aug 2025286 PMAQI
1st Aug 2025217 PMAQI
1st Aug 2025218 PMAQI
1st Aug 2025229 PMAQI
1st Aug 20252410 PMAQI
1st Aug 20252611 PMAQI
2nd Aug 20252612 AMAQI
2nd Aug 2025261 AMAQI
2nd Aug 2025232 AMAQI
2nd Aug 2025223 AMAQI
2nd Aug 2025214 AMAQI
2nd Aug 2025215 AMAQI

14°C13/16°C

2nd Aug 2025206 AMAQI
2nd Aug 2025187 AMAQI
2nd Aug 2025208 AMAQI
2nd Aug 2025199 AMAQI
2nd Aug 20251910 AMAQI
2nd Aug 20251911 AMAQI
2nd Aug 20252012 PMAQI
2nd Aug 2025221 PMAQI
2nd Aug 2025232 PMAQI
2nd Aug 2025203 PMAQI
2nd Aug 2025214 PMAQI
2nd Aug 2025245 PMAQI
2nd Aug 2025236 PMAQI
2nd Aug 2025227 PMAQI
2nd Aug 2025268 PMAQI
2nd Aug 2025309 PMAQI
2nd Aug 20253110 PMAQI
2nd Aug 20253211 PMAQI
3rd Aug 20253312 AMAQI
3rd Aug 2025351 AMAQI
3rd Aug 2025352 AMAQI
3rd Aug 2025333 AMAQI
3rd Aug 2025304 AMAQI
3rd Aug 2025305 AMAQI

14°C13/16°C

3rd Aug 2025286 AMAQI
3rd Aug 2025287 AMAQI
3rd Aug 2025288 AMAQI
3rd Aug 2025279 AMAQI
3rd Aug 20252810 AMAQI
3rd Aug 20252611 AMAQI
3rd Aug 20252812 PMAQI
3rd Aug 2025291 PMAQI
3rd Aug 2025292 PMAQI
3rd Aug 2025303 PMAQI
3rd Aug 2025314 PMAQI
3rd Aug 2025315 PMAQI
3rd Aug 2025286 PMAQI
3rd Aug 2025317 PMAQI
3rd Aug 2025288 PMAQI
3rd Aug 2025289 PMAQI
3rd Aug 20253110 PMAQI
3rd Aug 20253311 PMAQI
4th Aug 20253412 AMAQI
4th Aug 2025331 AMAQI
4th Aug 2025322 AMAQI
4th Aug 2025323 AMAQI
4th Aug 2025344 AMAQI
4th Aug 2025335 AMAQI

14°C13/15°C

4th Aug 2025346 AMAQI
4th Aug 2025327 AMAQI
4th Aug 2025308 AMAQI
4th Aug 2025319 AMAQI
4th Aug 20253010 AMAQI
4th Aug 20252611 AMAQI
4th Aug 20253012 PMAQI
4th Aug 2025301 PMAQI
4th Aug 2025302 PMAQI
4th Aug 2025303 PMAQI
4th Aug 2025284 PMAQI
4th Aug 2025295 PMAQI
4th Aug 2025296 PMAQI
4th Aug 2025307 PMAQI
4th Aug 2025288 PMAQI
4th Aug 2025269 PMAQI
4th Aug 20252610 PMAQI
4th Aug 20252511 PMAQI
5th Aug 20252612 AMAQI
5th Aug 2025271 AMAQI
5th Aug 2025262 AMAQI
5th Aug 2025263 AMAQI
5th Aug 2025264 AMAQI
5th Aug 2025275 AMAQI

14°C13/16°C

5th Aug 2025286 AMAQI
5th Aug 2025267 AMAQI
5th Aug 2025268 AMAQI
5th Aug 2025289 AMAQI
5th Aug 20253010 AMAQI
5th Aug 20253011 AMAQI
5th Aug 20253212 PMAQI
5th Aug 2025311 PMAQI
5th Aug 2025322 PMAQI
5th Aug 2025313 PMAQI
5th Aug 2025314 PMAQI
5th Aug 2025365 PMAQI
5th Aug 2025366 PMAQI
5th Aug 2025327 PMAQI
5th Aug 2025318 PMAQI
5th Aug 2025249 PMAQI
5th Aug 20252310 PMAQI
5th Aug 20252811 PMAQI
6th Aug 20252912 AMAQI
6th Aug 2025291 AMAQI
6th Aug 2025292 AMAQI
6th Aug 2025283 AMAQI
6th Aug 2025254 AMAQI
6th Aug 2025275 AMAQI

14°C12/17°C

6th Aug 2025256 AMAQI
6th Aug 2025247 AMAQI
6th Aug 2025278 AMAQI
6th Aug 2025249 AMAQI
6th Aug 20252610 AMAQI
6th Aug 20252511 AMAQI
6th Aug 20252912 PMAQI
6th Aug 2025321 PMAQI
6th Aug 2025342 PMAQI
6th Aug 2025323 PMAQI
6th Aug 2025284 PMAQI
6th Aug 2025275 PMAQI
6th Aug 2025226 PMAQI
6th Aug 2025267 PMAQI
6th Aug 2025258 PMAQI
6th Aug 2025209 PMAQI
6th Aug 20252110 PMAQI
6th Aug 20252011 PMAQI
7th Aug 20252312 AMAQI
7th Aug 2025241 AMAQI
7th Aug 2025262 AMAQI
7th Aug 2025253 AMAQI
7th Aug 2025214 AMAQI
7th Aug 2025245 AMAQI

16°C13/18°C

7th Aug 2025256 AMAQI
7th Aug 2025237 AMAQI
7th Aug 2025208 AMAQI
7th Aug 2025229 AMAQI
7th Aug 20252410 AMAQI
7th Aug 20252511 AMAQI
7th Aug 20252012 PMAQI
7th Aug 2025201 PMAQI
7th Aug 2025222 PMAQI
7th Aug 2025293 PMAQI
7th Aug 2025284 PMAQI
7th Aug 2025305 PMAQI
7th Aug 2025316 PMAQI
7th Aug 2025277 PMAQI
7th Aug 2025258 PMAQI
7th Aug 2025269 PMAQI
7th Aug 20253010 PMAQI
7th Aug 20253111 PMAQI
8th Aug 20253312 AMAQI
8th Aug 2025361 AMAQI
8th Aug 2025372 AMAQI
8th Aug 2025343 AMAQI
8th Aug 2025324 AMAQI
8th Aug 2025305 AMAQI

16°C15/17°C

8th Aug 2025296 AMAQI
8th Aug 2025307 AMAQI
8th Aug 2025288 AMAQI
8th Aug 2025289 AMAQI
8th Aug 20253010 AMAQI
8th Aug 20253011 AMAQI
8th Aug 20253712 PMAQI
8th Aug 2025341 PMAQI
8th Aug 2025292 PMAQI
8th Aug 2025293 PMAQI
8th Aug 2025284 PMAQI
8th Aug 2025285 PMAQI
8th Aug 2025306 PMAQI
8th Aug 2025347 PMAQI
8th Aug 2025338 PMAQI
8th Aug 2025329 PMAQI
8th Aug 20252810 PMAQI
8th Aug 20253211 PMAQI
9th Aug 20253312 AMAQI
9th Aug 2025381 AMAQI
9th Aug 2025392 AMAQI
9th Aug 2025403 AMAQI
9th Aug 2025394 AMAQI
9th Aug 2025375 AMAQI

17°C13/22°C

9th Aug 2025326 AMAQI
9th Aug 2025317 AMAQI
9th Aug 2025308 AMAQI
9th Aug 2025309 AMAQI
9th Aug 20253010 AMAQI
9th Aug 20253211 AMAQI
9th Aug 20253812 PMAQI
9th Aug 2025371 PMAQI
9th Aug 2025402 PMAQI
9th Aug 2025403 PMAQI
9th Aug 2025384 PMAQI
9th Aug 2025415 PMAQI
9th Aug 2025406 PMAQI
9th Aug 2025387 PMAQI
9th Aug 2025398 PMAQI
9th Aug 2025389 PMAQI
9th Aug 20253910 PMAQI
9th Aug 20253811 PMAQI
10th Aug 20253912 AMAQI
10th Aug 2025401 AMAQI
10th Aug 2025382 AMAQI
10th Aug 2025363 AMAQI
10th Aug 2025324 AMAQI
10th Aug 2025345 AMAQI

18°C14/23°C

10th Aug 2025376 AMAQI
10th Aug 2025407 AMAQI
10th Aug 2025348 AMAQI
10th Aug 2025319 AMAQI
10th Aug 20253610 AMAQI
10th Aug 20253511 AMAQI
10th Aug 20253312 PMAQI
10th Aug 2025321 PMAQI
10th Aug 2025342 PMAQI
10th Aug 2025333 PMAQI
10th Aug 2025324 PMAQI
10th Aug 2025305 PMAQI
10th Aug 2025306 PMAQI
10th Aug 2025337 PMAQI
10th Aug 2025328 PMAQI
10th Aug 2025269 PMAQI
10th Aug 20252510 PMAQI
10th Aug 20252511 PMAQI
11th Aug 20252812 AMAQI
11th Aug 2025291 AMAQI
11th Aug 2025282 AMAQI
11th Aug 2025253 AMAQI
11th Aug 2025264 AMAQI
11th Aug 2025245 AMAQI

17°C15/19°C

11th Aug 2025246 AMAQI
11th Aug 2025247 AMAQI
11th Aug 2025288 AMAQI
11th Aug 2025269 AMAQI
11th Aug 20252510 AMAQI
11th Aug 20252311 AMAQI
11th Aug 20252612 PMAQI
11th Aug 2025281 PMAQI
11th Aug 2025272 PMAQI
11th Aug 2025263 PMAQI
11th Aug 2025254 PMAQI
11th Aug 2025285 PMAQI
11th Aug 2025306 PMAQI
11th Aug 2025267 PMAQI
11th Aug 2025308 PMAQI
11th Aug 2025319 PMAQI
11th Aug 20253210 PMAQI
11th Aug 20253011 PMAQI
12th Aug 20253212 AMAQI
12th Aug 2025311 AMAQI
12th Aug 2025272 AMAQI
12th Aug 2025243 AMAQI
12th Aug 2025244 AMAQI
12th Aug 2025235 AMAQI

16°C13/19°C

12th Aug 2025226 AMAQI
12th Aug 2025247 AMAQI
12th Aug 2025258 AMAQI
12th Aug 2025249 AMAQI
12th Aug 20252510 AMAQI
12th Aug 20252311 AMAQI
12th Aug 20252312 PMAQI
12th Aug 2025241 PMAQI
12th Aug 2025242 PMAQI
12th Aug 2025243 PMAQI
12th Aug 2025274 PMAQI
12th Aug 2025305 PMAQI
12th Aug 2025306 PMAQI
12th Aug 2025267 PMAQI
12th Aug 2025298 PMAQI
12th Aug 2025329 PMAQI
12th Aug 20253210 PMAQI
12th Aug 20254111 PMAQI
13th Aug 20253612 AMAQI
13th Aug 2025361 AMAQI
13th Aug 2025342 AMAQI
13th Aug 2025313 AMAQI
13th Aug 2025284 AMAQI
13th Aug 2025245 AMAQI

15°C13/18°C

13th Aug 2025236 AMAQI
13th Aug 2025227 AMAQI
13th Aug 2025218 AMAQI
13th Aug 2025219 AMAQI
13th Aug 20252010 AMAQI
13th Aug 20252011 AMAQI
13th Aug 20252012 PMAQI
13th Aug 2025241 PMAQI
13th Aug 2025242 PMAQI
13th Aug 2025223 PMAQI
13th Aug 2025254 PMAQI
13th Aug 2025255 PMAQI
13th Aug 2025236 PMAQI
13th Aug 2025277 PMAQI
13th Aug 2025288 PMAQI
13th Aug 2025279 PMAQI
13th Aug 20252510 PMAQI
13th Aug 20252511 PMAQI
14th Aug 20252212 AMAQI
14th Aug 2025201 AMAQI
14th Aug 2025202 AMAQI
14th Aug 2025193 AMAQI
14th Aug 2025204 AMAQI
14th Aug 2025185 AMAQI

14°C13/16°C

14th Aug 2025176 AMAQI
14th Aug 2025187 AMAQI
14th Aug 2025188 AMAQI
14th Aug 2025169 AMAQI
14th Aug 20251510 AMAQI
14th Aug 20251511 AMAQI
14th Aug 20251812 PMAQI
14th Aug 2025181 PMAQI
14th Aug 2025182 PMAQI
14th Aug 2025183 PMAQI
14th Aug 2025214 PMAQI
14th Aug 2025245 PMAQI
14th Aug 2025266 PMAQI
14th Aug 2025197 PMAQI
14th Aug 2025248 PMAQI
14th Aug 2025269 PMAQI
14th Aug 20252810 PMAQI
14th Aug 20252911 PMAQI
15th Aug 20252812 AMAQI
15th Aug 2025281 AMAQI
15th Aug 2025262 AMAQI
15th Aug 2025273 AMAQI
15th Aug 2025274 AMAQI
15th Aug 2025265 AMAQI

14°C13/16°C

15th Aug 2025246 AMAQI
15th Aug 2025227 AMAQI
15th Aug 2025248 AMAQI
15th Aug 2025249 AMAQI
15th Aug 20252610 AMAQI
15th Aug 20252711 AMAQI
15th Aug 20252612 PMAQI
15th Aug 2025281 PMAQI
15th Aug 2025392 PMAQI
15th Aug 2025333 PMAQI
15th Aug 2025274 PMAQI
15th Aug 2025305 PMAQI
15th Aug 2025286 PMAQI
15th Aug 2025267 PMAQI
15th Aug 2025248 PMAQI
15th Aug 2025239 PMAQI
15th Aug 20252310 PMAQI
15th Aug 20252311 PMAQI
16th Aug 20252212 AMAQI
16th Aug 2025201 AMAQI
16th Aug 2025182 AMAQI
16th Aug 2025213 AMAQI
16th Aug 2025194 AMAQI
16th Aug 2025195 AMAQI

15°C13/17°C

6 AM
1 PM
8 PM
1 AM
5 AM

--°C/°C

Day time
Avg. Highest Time
12 PM - 8 PM

28AQI

9 hours / Day
270 hours / Month
Avg. Lowest Time
6 AM - 11 AM

25AQI

6 hours / Day
180 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 PM to 8 PM (Avg. 28), while the lowest AQI was between 6 AM to 11 AM (Avg. 25).
Night time
Avg. Highest Time
12 AM - 1 AM

29AQI

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

25AQI

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. 29), while the lowest AQI was between 4 AM to 5 AM (Avg. 25).

2025 Days Vs Air Quality

Eureka, California, United States

2025

96%

218

4%

9

Total number of days with different AQI categories in last 228 days in 2025 (137 days remaining)

Good
218 Days
Moderate
9 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 96%

Health Risk Level:

Very Low

In 2025, 96% of 228 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

Eureka, California, 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
36AQI
2nd January 2025
33AQI
3rd January 2025
34AQI
4th January 2025
24AQI
5th January 2025
31AQI
6th January 2025
28AQI
7th January 2025
23AQI
8th January 2025
33AQI
9th January 2025
37AQI
10th January 2025
46AQI
11th January 2025
28AQI
12th January 2025
27AQI
13th January 2025
28AQI
14th January 2025
44AQI
15th January 2025
52AQI
16th January 2025
50AQI
17th January 2025
43AQI
18th January 2025
43AQI
19th January 2025
52AQI
20th January 2025
41AQI
21st January 2025
52AQI
22nd January 2025
56AQI
23rd January 2025
51AQI
24th January 2025
53AQI
25th January 2025
38AQI
26th January 2025
38AQI
27th January 2025
43AQI
28th January 2025
54AQI
29th January 2025
64AQI
30th January 2025
66AQI
31st January 2025
49AQI
1st February 2025
34AQI
2nd February 2025
31AQI
3rd February 2025
31AQI
4th February 2025
30AQI
5th February 2025
31AQI
6th February 2025
41AQI
7th February 2025
31AQI
8th February 2025
36AQI
9th February 2025
33AQI
10th February 2025
27AQI
11th February 2025
41AQI
12th February 2025
49AQI
13th February 2025
34AQI
14th February 2025
28AQI
15th February 2025
34AQI
16th February 2025
33AQI
17th February 2025
35AQI
18th February 2025
39AQI
19th February 2025
29AQI
20th February 2025
28AQI
21st February 2025
36AQI
22nd February 2025
50AQI
23rd February 2025
34AQI
24th February 2025
31AQI
25th February 2025
30AQI
26th February 2025
38AQI
27th February 2025
44AQI
28th February 2025
45AQI
1st March 2025
40AQI
2nd March 2025
27AQI
3rd March 2025
29AQI
4th March 2025
29AQI
5th March 2025
34AQI
6th March 2025
22AQI
7th March 2025
30AQI
8th March 2025
38AQI
9th March 2025
27AQI
10th March 2025
35AQI
11th March 2025
38AQI
12th March 2025
27AQI
13th March 2025
25AQI
14th March 2025
25AQI
15th March 2025
26AQI
16th March 2025
30AQI
17th March 2025
23AQI
18th March 2025
26AQI
19th March 2025
30AQI
20th March 2025
21AQI
21st March 2025
23AQI
22nd March 2025
23AQI
23rd March 2025
30AQI
24th March 2025
31AQI
25th March 2025
36AQI
26th March 2025
32AQI
27th March 2025
23AQI
28th March 2025
27AQI
29th March 2025
24AQI
30th March 2025
30AQI
31st March 2025
24AQI
1st April 2025
22AQI
2nd April 2025
22AQI
3rd April 2025
25AQI
4th April 2025
24AQI
5th April 2025
27AQI
6th April 2025
25AQI
7th April 2025
17AQI
8th April 2025
20AQI
9th April 2025
27AQI
10th April 2025
23AQI
11th April 2025
27AQI
12th April 2025
26AQI
13th April 2025
29AQI
14th April 2025
31AQI
15th April 2025
37AQI
16th April 2025
37AQI
17th April 2025
32AQI
18th April 2025
33AQI
19th April 2025
37AQI
20th April 2025
39AQI
21st April 2025
33AQI
22nd April 2025
38AQI
23rd April 2025
43AQI
24th April 2025
43AQI
25th April 2025
26AQI
26th April 2025
31AQI
27th April 2025
24AQI
28th April 2025
23AQI
29th April 2025
27AQI
30th April 2025
32AQI
1st May 2025
30AQI
2nd May 2025
32AQI
3rd May 2025
24AQI
4th May 2025
27AQI
5th May 2025
28AQI
6th May 2025
30AQI
7th May 2025
33AQI
8th May 2025
30AQI
9th May 2025
31AQI
10th May 2025
23AQI
11th May 2025
21AQI
12th May 2025
19AQI
13th May 2025
20AQI
14th May 2025
23AQI
15th May 2025
24AQI
16th May 2025
25AQI
17th May 2025
26AQI
18th May 2025
24AQI
19th May 2025
23AQI
20th May 2025
20AQI
21st May 2025
30AQI
22nd May 2025
27AQI
23rd May 2025
22AQI
24th May 2025
29AQI
25th May 2025
27AQI
26th May 2025
20AQI
27th May 2025
27AQI
28th May 2025
33AQI
29th May 2025
25AQI
30th May 2025
33AQI
31st May 2025
35AQI
1st June 2025
42AQI
2nd June 2025
48AQI
3rd June 2025
47AQI
4th June 2025
36AQI
5th June 2025
38AQI
6th June 2025
35AQI
7th June 2025
27AQI
8th June 2025
26AQI
9th June 2025
27AQI
10th June 2025
31AQI
11th June 2025
37AQI
12th June 2025
42AQI
13th June 2025
43AQI
14th June 2025
39AQI
15th June 2025
36AQI
16th June 2025
28AQI
17th June 2025
20AQI
18th June 2025
22AQI
19th June 2025
31AQI
20th June 2025
34AQI
21st June 2025
20AQI
22nd June 2025
18AQI
23rd June 2025
20AQI
24th June 2025
23AQI
25th June 2025
27AQI
26th June 2025
23AQI
27th June 2025
26AQI
28th June 2025
27AQI
29th June 2025
33AQI
30th June 2025
34AQI
1st July 2025
31AQI
2nd July 2025
30AQI
3rd July 2025
23AQI
4th July 2025
28AQI
5th July 2025
39AQI
6th July 2025
33AQI
7th July 2025
30AQI
8th July 2025
26AQI
9th July 2025
24AQI
10th July 2025
32AQI
11th July 2025
48AQI
12th July 2025
40AQI
13th July 2025
34AQI
14th July 2025
35AQI
15th July 2025
39AQI
16th July 2025
31AQI
17th July 2025
29AQI
18th July 2025
27AQI
19th July 2025
32AQI
20th July 2025
28AQI
21st July 2025
32AQI
22nd July 2025
24AQI
23rd July 2025
23AQI
24th July 2025
20AQI
25th July 2025
21AQI
26th July 2025
19AQI
27th July 2025
21AQI
28th July 2025
27AQI
29th July 2025
28AQI
30th July 2025
29AQI
31st July 2025
26AQI
1st August 2025
23AQI
2nd August 2025
23AQI
3rd August 2025
30AQI
4th August 2025
30AQI
5th August 2025
29AQI
6th August 2025
26AQI
7th August 2025
25AQI
8th August 2025
32AQI
9th August 2025
37AQI
10th August 2025
33AQI
11th August 2025
27AQI
12th August 2025
27AQI
13th August 2025
26AQI
14th August 2025
21AQI
15th August 2025
27AQI

42AQI

35AQI

29AQI

29AQI

26AQI

31AQI

29AQI

28AQI

No. of days

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

202531AQI

22
9
28
31
30
31
30
31
15
218
9

Highest AQI recorded in

January

42AQI

Lowest AQI recorded in

May

26AQI

202434AQI

16
1
2
12
29
31
31
27
1
28
3
24
6
19
12
218
24

Highest AQI recorded in

April

55AQI

Lowest AQI recorded in

May

22AQI

202344AQI

3
30
1
33
1

Highest AQI recorded in

November

47AQI

Lowest AQI recorded in

December

44AQI

202137AQI

2
9
2
17
2
28
4

Highest AQI recorded in

August

43AQI

Lowest AQI recorded in

July

13AQI

202078AQI

1
1

Highest AQI recorded in

October

78AQI

Lowest AQI recorded in

October

78AQI

Most & Least Polluted Years Over the Last 5 Years

Most Polluted Year Recorded
2020(Avg.)
78AQI
Least Polluted Year Recorded
2025(Avg.)
31AQI

Eureka's annual 2025 AQI (31) shows an average percentage change of -27.6% (improved AQI) compared to previous years: 2020 (78), 2021 (37), 2023 (44), 2024 (34).