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+
October Air Quality Analysis
Eureka, California, United States
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
4th Oct 2024
61AQILowest AQI recorded on
11th Oct 2025
14AQISame Day Analysis (24th October ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 43 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 24th Oct - 25th Oct 2025
Eureka, California, United States
AQI
Day
Night
.
7 AM24th Oct 2025
6 PM
6 AM25th Oct 2025
Day time
Avg. Highest Time
7AM24th Oct
43AQI
Avg. Lowest Time
5PM24th Oct
18AQI
Night time
Avg. Highest Time
2AM25th Oct
29AQI
Avg. Lowest Time
8PM24th Oct
19AQI
In the last 24 hours,
Eureka's AQI reached its highest point of 43 at 7 AM during the Day, while the lowest point, undefined, was recorded at 6 AM during the Night between 24th Oct and 25th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Eureka, California, United States
SepOct
25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 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
Day
Night
25th Sep 2025307 AMAQI
25th Sep 2025348 AMAQI
25th Sep 2025359 AMAQI
25th Sep 20253510 AMAQI
25th Sep 20254311 AMAQI
25th Sep 20254112 PMAQI
25th Sep 2025451 PMAQI
25th Sep 2025502 PMAQI
25th Sep 2025413 PMAQI
25th Sep 2025384 PMAQI
25th Sep 2025375 PMAQI
25th Sep 2025386 PMAQI
25th Sep 2025397 PMAQI
25th Sep 2025418 PMAQI
25th Sep 2025399 PMAQI
25th Sep 20254010 PMAQI
25th Sep 20253811 PMAQI
26th Sep 20253012 AMAQI
26th Sep 2025251 AMAQI
26th Sep 2025242 AMAQI
26th Sep 2025273 AMAQI
26th Sep 2025264 AMAQI
26th Sep 2025255 AMAQI
26th Sep 2025216 AMAQI
15°C13/17°C
26th Sep 2025227 AMAQI
26th Sep 2025228 AMAQI
26th Sep 2025229 AMAQI
26th Sep 20252210 AMAQI
26th Sep 20252311 AMAQI
26th Sep 20252312 PMAQI
26th Sep 2025251 PMAQI
26th Sep 2025262 PMAQI
26th Sep 2025283 PMAQI
26th Sep 2025304 PMAQI
26th Sep 2025305 PMAQI
26th Sep 2025316 PMAQI
26th Sep 2025317 PMAQI
26th Sep 2025318 PMAQI
26th Sep 2025309 PMAQI
26th Sep 20252810 PMAQI
26th Sep 20252511 PMAQI
27th Sep 20252012 AMAQI
27th Sep 2025171 AMAQI
27th Sep 2025172 AMAQI
27th Sep 2025163 AMAQI
27th Sep 2025194 AMAQI
27th Sep 2025215 AMAQI
27th Sep 2025206 AMAQI
14°C9/20°C
27th Sep 2025207 AMAQI
27th Sep 2025198 AMAQI
27th Sep 2025199 AMAQI
27th Sep 20252010 AMAQI
27th Sep 20252211 AMAQI
27th Sep 20252512 PMAQI
27th Sep 2025261 PMAQI
27th Sep 2025242 PMAQI
27th Sep 2025263 PMAQI
27th Sep 2025274 PMAQI
27th Sep 2025245 PMAQI
27th Sep 2025226 PMAQI
27th Sep 2025287 PMAQI
27th Sep 2025478 PMAQI
27th Sep 2025909 PMAQI
27th Sep 202515210 PMAQI
27th Sep 202510411 PMAQI
28th Sep 20255012 AMAQI
28th Sep 2025451 AMAQI
28th Sep 2025612 AMAQI
28th Sep 2025643 AMAQI
28th Sep 2025614 AMAQI
28th Sep 2025585 AMAQI
28th Sep 2025566 AMAQI
13°C9/16°C
28th Sep 2025607 AMAQI
28th Sep 2025608 AMAQI
28th Sep 2025589 AMAQI
28th Sep 20255710 AMAQI
28th Sep 20255711 AMAQI
28th Sep 20255612 PMAQI
28th Sep 2025551 PMAQI
28th Sep 2025572 PMAQI
28th Sep 2025603 PMAQI
28th Sep 2025644 PMAQI
28th Sep 2025665 PMAQI
28th Sep 2025686 PMAQI
28th Sep 2025687 PMAQI
28th Sep 2025688 PMAQI
28th Sep 2025629 PMAQI
28th Sep 20255510 PMAQI
28th Sep 20255811 PMAQI
29th Sep 20255712 AMAQI
29th Sep 2025521 AMAQI
29th Sep 2025502 AMAQI
29th Sep 2025543 AMAQI
29th Sep 2025554 AMAQI
29th Sep 2025565 AMAQI
29th Sep 2025546 AMAQI
16°C13/21°C
29th Sep 2025607 AMAQI
29th Sep 2025658 AMAQI
29th Sep 2025589 AMAQI
29th Sep 20256110 AMAQI
29th Sep 20256411 AMAQI
29th Sep 20256612 PMAQI
29th Sep 2025671 PMAQI
29th Sep 2025552 PMAQI
29th Sep 2025433 PMAQI
29th Sep 2025374 PMAQI
29th Sep 2025295 PMAQI
29th Sep 2025206 PMAQI
29th Sep 2025227 PMAQI
29th Sep 2025318 PMAQI
29th Sep 2025349 PMAQI
29th Sep 20253610 PMAQI
29th Sep 20253511 PMAQI
30th Sep 20253612 AMAQI
30th Sep 2025321 AMAQI
30th Sep 2025312 AMAQI
30th Sep 2025283 AMAQI
30th Sep 2025224 AMAQI
30th Sep 2025215 AMAQI
30th Sep 2025156 AMAQI
16°C13/18°C
30th Sep 2025187 AMAQI
30th Sep 2025218 AMAQI
30th Sep 2025169 AMAQI
30th Sep 20251310 AMAQI
30th Sep 20251811 AMAQI
30th Sep 20251712 PMAQI
30th Sep 2025161 PMAQI
30th Sep 2025202 PMAQI
30th Sep 2025193 PMAQI
30th Sep 2025194 PMAQI
30th Sep 2025175 PMAQI
30th Sep 2025186 PMAQI
30th Sep 2025137 PMAQI
30th Sep 2025178 PMAQI
30th Sep 2025179 PMAQI
30th Sep 20251410 PMAQI
30th Sep 20251611 PMAQI
1st Oct 20251812 AMAQI
1st Oct 2025201 AMAQI
1st Oct 2025192 AMAQI
1st Oct 2025183 AMAQI
1st Oct 2025104 AMAQI
1st Oct 2025105 AMAQI
1st Oct 2025136 AMAQI
16°C11/20°C
1st Oct 2025127 AMAQI
1st Oct 2025138 AMAQI
1st Oct 202589 AMAQI
1st Oct 20251410 AMAQI
1st Oct 20252411 AMAQI
1st Oct 20252012 PMAQI
1st Oct 2025331 PMAQI
1st Oct 2025502 PMAQI
1st Oct 2025493 PMAQI
1st Oct 2025494 PMAQI
1st Oct 2025505 PMAQI
1st Oct 2025476 PMAQI
1st Oct 2025467 PMAQI
1st Oct 2025458 PMAQI
1st Oct 2025469 PMAQI
1st Oct 20256310 PMAQI
1st Oct 20255511 PMAQI
2nd Oct 20255212 AMAQI
2nd Oct 2025321 AMAQI
2nd Oct 2025222 AMAQI
2nd Oct 2025183 AMAQI
2nd Oct 2025144 AMAQI
2nd Oct 2025195 AMAQI
2nd Oct 2025286 AMAQI
16°C13/20°C
2nd Oct 2025127 AMAQI
2nd Oct 2025158 AMAQI
2nd Oct 2025229 AMAQI
2nd Oct 20253510 AMAQI
2nd Oct 20252711 AMAQI
2nd Oct 20253412 PMAQI
2nd Oct 2025481 PMAQI
2nd Oct 2025532 PMAQI
2nd Oct 2025543 PMAQI
2nd Oct 2025504 PMAQI
2nd Oct 2025395 PMAQI
2nd Oct 2025256 PMAQI
2nd Oct 2025227 PMAQI
2nd Oct 2025178 PMAQI
2nd Oct 202599 PMAQI
2nd Oct 2025610 PMAQI
2nd Oct 2025811 PMAQI
3rd Oct 2025712 AMAQI
3rd Oct 2025101 AMAQI
3rd Oct 2025182 AMAQI
3rd Oct 2025203 AMAQI
3rd Oct 2025174 AMAQI
3rd Oct 2025205 AMAQI
3rd Oct 2025216 AMAQI
14°C12/16°C
3rd Oct 2025217 AMAQI
3rd Oct 2025188 AMAQI
3rd Oct 2025189 AMAQI
3rd Oct 20251710 AMAQI
3rd Oct 20251711 AMAQI
3rd Oct 20251912 PMAQI
3rd Oct 2025321 PMAQI
3rd Oct 2025472 PMAQI
3rd Oct 2025443 PMAQI
3rd Oct 2025404 PMAQI
3rd Oct 2025205 PMAQI
3rd Oct 2025206 PMAQI
3rd Oct 2025207 PMAQI
3rd Oct 2025198 PMAQI
3rd Oct 2025229 PMAQI
3rd Oct 20252510 PMAQI
3rd Oct 20252311 PMAQI
4th Oct 20252112 AMAQI
4th Oct 2025261 AMAQI
4th Oct 2025252 AMAQI
4th Oct 2025253 AMAQI
4th Oct 2025274 AMAQI
4th Oct 2025245 AMAQI
4th Oct 2025226 AMAQI
14°C12/16°C
4th Oct 2025187 AMAQI
4th Oct 2025148 AMAQI
4th Oct 2025169 AMAQI
4th Oct 20251810 AMAQI
4th Oct 20252211 AMAQI
4th Oct 20252312 PMAQI
4th Oct 2025261 PMAQI
4th Oct 2025272 PMAQI
4th Oct 2025183 PMAQI
4th Oct 2025174 PMAQI
4th Oct 2025165 PMAQI
4th Oct 2025176 PMAQI
4th Oct 2025207 PMAQI
4th Oct 2025238 PMAQI
4th Oct 2025209 PMAQI
4th Oct 20251910 PMAQI
4th Oct 20251811 PMAQI
5th Oct 20251812 AMAQI
5th Oct 2025181 AMAQI
5th Oct 2025162 AMAQI
5th Oct 2025163 AMAQI
5th Oct 2025154 AMAQI
5th Oct 2025175 AMAQI
5th Oct 2025186 AMAQI
14°C12/16°C
5th Oct 2025197 AMAQI
5th Oct 2025258 AMAQI
5th Oct 2025259 AMAQI
5th Oct 20251710 AMAQI
5th Oct 20251611 AMAQI
5th Oct 20251512 PMAQI
5th Oct 2025161 PMAQI
5th Oct 2025162 PMAQI
5th Oct 2025153 PMAQI
5th Oct 2025164 PMAQI
5th Oct 2025185 PMAQI
5th Oct 2025256 PMAQI
5th Oct 2025307 PMAQI
5th Oct 2025338 PMAQI
5th Oct 2025349 PMAQI
5th Oct 20252810 PMAQI
5th Oct 20252411 PMAQI
6th Oct 20252012 AMAQI
6th Oct 2025151 AMAQI
6th Oct 2025162 AMAQI
6th Oct 2025153 AMAQI
6th Oct 2025114 AMAQI
6th Oct 2025125 AMAQI
6th Oct 202596 AMAQI
15°C11/21°C
6th Oct 2025107 AMAQI
6th Oct 2025118 AMAQI
6th Oct 2025119 AMAQI
6th Oct 20251110 AMAQI
7th Oct 2025154 AMAQI
7th Oct 2025105 AMAQI
7th Oct 2025376 AMAQI
16°C11/23°C
7th Oct 2025407 AMAQI
7th Oct 2025418 AMAQI
7th Oct 2025379 AMAQI
7th Oct 20254010 AMAQI
7th Oct 20253911 AMAQI
7th Oct 20254012 PMAQI
7th Oct 2025411 PMAQI
7th Oct 2025302 PMAQI
7th Oct 2025223 PMAQI
7th Oct 2025334 PMAQI
7th Oct 2025175 PMAQI
7th Oct 2025296 PMAQI
7th Oct 2025237 PMAQI
7th Oct 2025218 PMAQI
7th Oct 2025219 PMAQI
7th Oct 20252010 PMAQI
7th Oct 20251811 PMAQI
8th Oct 20252012 AMAQI
8th Oct 2025231 AMAQI
8th Oct 2025362 AMAQI
8th Oct 2025383 AMAQI
8th Oct 2025394 AMAQI
8th Oct 2025265 AMAQI
8th Oct 2025116 AMAQI
15°C10/24°C
8th Oct 2025117 AMAQI
8th Oct 202578 AMAQI
8th Oct 2025109 AMAQI
8th Oct 20251210 AMAQI
8th Oct 20253711 AMAQI
8th Oct 20255112 PMAQI
8th Oct 2025531 PMAQI
8th Oct 2025382 PMAQI
8th Oct 2025323 PMAQI
8th Oct 2025244 PMAQI
8th Oct 2025285 PMAQI
8th Oct 2025336 PMAQI
8th Oct 2025317 PMAQI
8th Oct 2025258 PMAQI
8th Oct 2025359 PMAQI
8th Oct 20254110 PMAQI
8th Oct 20253811 PMAQI
9th Oct 20253512 AMAQI
9th Oct 2025311 AMAQI
9th Oct 2025192 AMAQI
9th Oct 2025163 AMAQI
9th Oct 2025154 AMAQI
9th Oct 2025145 AMAQI
9th Oct 2025116 AMAQI
13°C10/17°C
9th Oct 2025127 AMAQI
9th Oct 2025128 AMAQI
9th Oct 2025159 AMAQI
9th Oct 20251310 AMAQI
9th Oct 20251811 AMAQI
9th Oct 20252912 PMAQI
9th Oct 2025331 PMAQI
9th Oct 2025362 PMAQI
9th Oct 2025353 PMAQI
9th Oct 2025354 PMAQI
9th Oct 2025345 PMAQI
9th Oct 2025316 PMAQI
9th Oct 2025297 PMAQI
9th Oct 2025348 PMAQI
9th Oct 2025249 PMAQI
9th Oct 20252810 PMAQI
9th Oct 20252611 PMAQI
10th Oct 20252212 AMAQI
10th Oct 2025181 AMAQI
10th Oct 202592 AMAQI
10th Oct 2025173 AMAQI
10th Oct 2025134 AMAQI
10th Oct 202585 AMAQI
10th Oct 202576 AMAQI
12°C8/17°C
10th Oct 2025127 AMAQI
10th Oct 2025158 AMAQI
10th Oct 202579 AMAQI
10th Oct 20251610 AMAQI
10th Oct 20252311 AMAQI
10th Oct 20253512 PMAQI
10th Oct 2025321 PMAQI
10th Oct 2025342 PMAQI
10th Oct 2025393 PMAQI
10th Oct 2025354 PMAQI
10th Oct 2025355 PMAQI
10th Oct 2025356 PMAQI
10th Oct 2025307 PMAQI
10th Oct 2025348 PMAQI
10th Oct 2025239 PMAQI
10th Oct 20252510 PMAQI
10th Oct 20251011 PMAQI
11th Oct 20251012 AMAQI
11th Oct 2025101 AMAQI
11th Oct 202592 AMAQI
11th Oct 202583 AMAQI
11th Oct 202564 AMAQI
11th Oct 202565 AMAQI
11th Oct 202566 AMAQI
13°C10/18°C
11th Oct 2025107 AMAQI
11th Oct 2025118 AMAQI
11th Oct 2025179 AMAQI
11th Oct 20251910 AMAQI
11th Oct 20251811 AMAQI
11th Oct 20252512 PMAQI
11th Oct 2025151 PMAQI
11th Oct 202562 PMAQI
11th Oct 202583 PMAQI
11th Oct 2025104 PMAQI
11th Oct 2025295 PMAQI
11th Oct 2025306 PMAQI
11th Oct 2025107 PMAQI
11th Oct 2025148 PMAQI
11th Oct 2025149 PMAQI
11th Oct 20251810 PMAQI
11th Oct 20251811 PMAQI
12th Oct 20252412 AMAQI
12th Oct 2025401 AMAQI
12th Oct 2025372 AMAQI
12th Oct 2025413 AMAQI
12th Oct 2025384 AMAQI
12th Oct 2025365 AMAQI
12th Oct 2025186 AMAQI
13°C9/18°C
12th Oct 2025167 AMAQI
12th Oct 2025108 AMAQI
12th Oct 2025189 AMAQI
12th Oct 20252310 AMAQI
12th Oct 20251911 AMAQI
12th Oct 20251912 PMAQI
12th Oct 2025271 PMAQI
12th Oct 2025232 PMAQI
12th Oct 2025263 PMAQI
12th Oct 2025264 PMAQI
12th Oct 2025295 PMAQI
12th Oct 2025406 PMAQI
12th Oct 2025417 PMAQI
12th Oct 2025388 PMAQI
12th Oct 2025329 PMAQI
12th Oct 20253710 PMAQI
12th Oct 20253611 PMAQI
13th Oct 20253312 AMAQI
13th Oct 2025201 AMAQI
13th Oct 2025142 AMAQI
13th Oct 2025143 AMAQI
13th Oct 2025124 AMAQI
13th Oct 2025185 AMAQI
13th Oct 202596 AMAQI
13°C10/17°C
13th Oct 202577 AMAQI
13th Oct 202578 AMAQI
13th Oct 2025109 AMAQI
13th Oct 20251010 AMAQI
13th Oct 20251511 AMAQI
13th Oct 20251812 PMAQI
13th Oct 202571 PMAQI
13th Oct 2025202 PMAQI
13th Oct 2025303 PMAQI
13th Oct 2025244 PMAQI
13th Oct 2025175 PMAQI
13th Oct 2025156 PMAQI
13th Oct 2025227 PMAQI
13th Oct 2025198 PMAQI
13th Oct 2025229 PMAQI
13th Oct 20252310 PMAQI
13th Oct 20252111 PMAQI
14th Oct 20252412 AMAQI
14th Oct 2025231 AMAQI
14th Oct 2025172 AMAQI
14th Oct 2025113 AMAQI
14th Oct 2025134 AMAQI
14th Oct 2025155 AMAQI
14th Oct 2025146 AMAQI
12°C10/15°C
14th Oct 2025157 AMAQI
14th Oct 2025238 AMAQI
14th Oct 2025239 AMAQI
14th Oct 20252810 AMAQI
14th Oct 20253511 AMAQI
14th Oct 20253812 PMAQI
14th Oct 2025401 PMAQI
14th Oct 2025362 PMAQI
14th Oct 2025283 PMAQI
14th Oct 2025274 PMAQI
14th Oct 2025315 PMAQI
14th Oct 2025336 PMAQI
14th Oct 2025297 PMAQI
14th Oct 2025308 PMAQI
14th Oct 2025359 PMAQI
14th Oct 20253210 PMAQI
14th Oct 20252911 PMAQI
15th Oct 20255412 AMAQI
15th Oct 2025591 AMAQI
15th Oct 2025572 AMAQI
15th Oct 2025573 AMAQI
15th Oct 2025584 AMAQI
15th Oct 2025555 AMAQI
15th Oct 2025536 AMAQI
12°C8/17°C
15th Oct 2025507 AMAQI
15th Oct 2025468 AMAQI
15th Oct 2025369 AMAQI
15th Oct 20251410 AMAQI
15th Oct 20252411 AMAQI
15th Oct 20253512 PMAQI
15th Oct 2025321 PMAQI
15th Oct 2025402 PMAQI
15th Oct 2025453 PMAQI
15th Oct 2025384 PMAQI
15th Oct 2025395 PMAQI
15th Oct 2025276 PMAQI
15th Oct 2025247 PMAQI
15th Oct 2025238 PMAQI
15th Oct 2025209 PMAQI
15th Oct 20254110 PMAQI
15th Oct 20256211 PMAQI
16th Oct 20255912 AMAQI
16th Oct 2025521 AMAQI
16th Oct 2025462 AMAQI
16th Oct 2025563 AMAQI
16th Oct 2025584 AMAQI
16th Oct 2025535 AMAQI
16th Oct 2025516 AMAQI
13°C10/17°C
16th Oct 2025557 AMAQI
16th Oct 2025548 AMAQI
16th Oct 2025549 AMAQI
16th Oct 20255610 AMAQI
16th Oct 20254511 AMAQI
16th Oct 20254812 PMAQI
16th Oct 2025431 PMAQI
16th Oct 2025402 PMAQI
16th Oct 2025383 PMAQI
16th Oct 2025354 PMAQI
16th Oct 2025195 PMAQI
16th Oct 2025246 PMAQI
16th Oct 2025207 PMAQI
16th Oct 2025238 PMAQI
16th Oct 2025249 PMAQI
16th Oct 20252410 PMAQI
16th Oct 20252111 PMAQI
17th Oct 20253212 AMAQI
17th Oct 2025611 AMAQI
17th Oct 2025602 AMAQI
17th Oct 2025583 AMAQI
17th Oct 2025614 AMAQI
17th Oct 2025615 AMAQI
17th Oct 2025656 AMAQI
12°C8/16°C
17th Oct 2025627 AMAQI
17th Oct 2025598 AMAQI
17th Oct 2025609 AMAQI
17th Oct 20256110 AMAQI
17th Oct 20255711 AMAQI
17th Oct 20255512 PMAQI
17th Oct 2025521 PMAQI
17th Oct 2025502 PMAQI
17th Oct 2025473 PMAQI
17th Oct 2025364 PMAQI
17th Oct 2025305 PMAQI
17th Oct 2025306 PMAQI
17th Oct 2025267 PMAQI
17th Oct 2025408 PMAQI
17th Oct 2025359 PMAQI
17th Oct 20252410 PMAQI
17th Oct 20253611 PMAQI
18th Oct 20255912 AMAQI
18th Oct 2025571 AMAQI
18th Oct 2025502 AMAQI
18th Oct 2025463 AMAQI
18th Oct 2025364 AMAQI
18th Oct 2025455 AMAQI
18th Oct 2025456 AMAQI
12°C9/18°C
18th Oct 2025297 AMAQI
18th Oct 2025308 AMAQI
18th Oct 2025319 AMAQI
18th Oct 20253810 AMAQI
18th Oct 20255211 AMAQI
18th Oct 20255412 PMAQI
18th Oct 2025511 PMAQI
18th Oct 2025462 PMAQI
18th Oct 2025453 PMAQI
18th Oct 2025404 PMAQI
18th Oct 2025385 PMAQI
18th Oct 2025416 PMAQI
18th Oct 2025447 PMAQI
18th Oct 2025508 PMAQI
18th Oct 2025499 PMAQI
18th Oct 20254710 PMAQI
18th Oct 20254011 PMAQI
19th Oct 20253412 AMAQI
19th Oct 2025671 AMAQI
19th Oct 2025672 AMAQI
19th Oct 2025533 AMAQI
19th Oct 2025454 AMAQI
19th Oct 2025435 AMAQI
19th Oct 2025256 AMAQI
13°C12/14°C
19th Oct 2025167 AMAQI
19th Oct 202598 AMAQI
19th Oct 2025219 AMAQI
19th Oct 20252010 AMAQI
19th Oct 20252211 AMAQI
19th Oct 20251812 PMAQI
19th Oct 2025171 PMAQI
19th Oct 2025142 PMAQI
19th Oct 2025173 PMAQI
19th Oct 2025214 PMAQI
19th Oct 2025135 PMAQI
19th Oct 2025166 PMAQI
19th Oct 2025207 PMAQI
19th Oct 2025178 PMAQI
19th Oct 2025219 PMAQI
19th Oct 20252810 PMAQI
19th Oct 20253711 PMAQI
20th Oct 20253612 AMAQI
20th Oct 2025521 AMAQI
20th Oct 2025612 AMAQI
20th Oct 2025483 AMAQI
20th Oct 2025434 AMAQI
20th Oct 2025385 AMAQI
20th Oct 2025156 AMAQI
13°C11/17°C
20th Oct 2025227 AMAQI
20th Oct 2025358 AMAQI
20th Oct 2025469 AMAQI
20th Oct 20255210 AMAQI
20th Oct 20255511 AMAQI
20th Oct 20254312 PMAQI
20th Oct 2025271 PMAQI
20th Oct 2025362 PMAQI
20th Oct 2025413 PMAQI
20th Oct 2025384 PMAQI
20th Oct 2025365 PMAQI
20th Oct 2025396 PMAQI
20th Oct 2025407 PMAQI
20th Oct 2025498 PMAQI
20th Oct 2025609 PMAQI
20th Oct 20255810 PMAQI
20th Oct 20256111 PMAQI
21st Oct 20256412 AMAQI
21st Oct 2025641 AMAQI
21st Oct 2025582 AMAQI
21st Oct 2025583 AMAQI
21st Oct 2025574 AMAQI
21st Oct 2025565 AMAQI
21st Oct 2025556 AMAQI
13°C9/18°C
21st Oct 2025457 AMAQI
21st Oct 2025498 AMAQI
21st Oct 2025539 AMAQI
21st Oct 20255110 AMAQI
21st Oct 20255211 AMAQI
21st Oct 20255412 PMAQI
21st Oct 2025531 PMAQI
21st Oct 2025582 PMAQI
21st Oct 2025663 PMAQI
21st Oct 2025664 PMAQI
21st Oct 2025595 PMAQI
21st Oct 2025646 PMAQI
21st Oct 2025767 PMAQI
21st Oct 2025808 PMAQI
21st Oct 2025679 PMAQI
21st Oct 20256110 PMAQI
21st Oct 20257011 PMAQI
22nd Oct 20258512 AMAQI
22nd Oct 2025851 AMAQI
22nd Oct 2025742 AMAQI
22nd Oct 2025623 AMAQI
22nd Oct 2025604 AMAQI
22nd Oct 2025615 AMAQI
22nd Oct 2025586 AMAQI
13°C8/21°C
22nd Oct 2025587 AMAQI
22nd Oct 2025608 AMAQI
22nd Oct 2025629 AMAQI
22nd Oct 20256110 AMAQI
22nd Oct 20255811 AMAQI
22nd Oct 20255912 PMAQI
22nd Oct 2025581 PMAQI
22nd Oct 2025532 PMAQI
22nd Oct 2025433 PMAQI
22nd Oct 2025404 PMAQI
22nd Oct 2025425 PMAQI
22nd Oct 2025426 PMAQI
22nd Oct 2025467 PMAQI
22nd Oct 2025478 PMAQI
22nd Oct 2025499 PMAQI
22nd Oct 20255510 PMAQI
22nd Oct 20256611 PMAQI
23rd Oct 20257212 AMAQI
23rd Oct 2025681 AMAQI
23rd Oct 2025592 AMAQI
23rd Oct 2025573 AMAQI
23rd Oct 2025594 AMAQI
23rd Oct 2025605 AMAQI
23rd Oct 2025586 AMAQI
13°C11/17°C
23rd Oct 2025567 AMAQI
23rd Oct 2025558 AMAQI
23rd Oct 2025539 AMAQI
23rd Oct 20255210 AMAQI
23rd Oct 20255311 AMAQI
23rd Oct 20255612 PMAQI
23rd Oct 2025501 PMAQI
23rd Oct 2025412 PMAQI
23rd Oct 2025413 PMAQI
23rd Oct 2025434 PMAQI
23rd Oct 2025425 PMAQI
23rd Oct 2025436 PMAQI
23rd Oct 2025427 PMAQI
23rd Oct 2025338 PMAQI
23rd Oct 2025349 PMAQI
23rd Oct 20253810 PMAQI
23rd Oct 20253911 PMAQI
24th Oct 20254312 AMAQI
24th Oct 2025491 AMAQI
24th Oct 2025522 AMAQI
24th Oct 2025543 AMAQI
24th Oct 2025524 AMAQI
24th Oct 2025505 AMAQI
24th Oct 2025476 AMAQI
13°C10/17°C
24th Oct 2025437 AMAQI
24th Oct 2025408 AMAQI
24th Oct 2025369 AMAQI
24th Oct 20253210 AMAQI
24th Oct 20253311 AMAQI
24th Oct 20253012 PMAQI
24th Oct 2025291 PMAQI
24th Oct 2025232 PMAQI
24th Oct 2025213 PMAQI
24th Oct 2025184 PMAQI
24th Oct 2025185 PMAQI
24th Oct 2025216 PMAQI
24th Oct 2025217 PMAQI
24th Oct 2025198 PMAQI
24th Oct 2025239 PMAQI
24th Oct 20252010 PMAQI
24th Oct 20252111 PMAQI
25th Oct 20252112 AMAQI
25th Oct 2025241 AMAQI
25th Oct 2025292 AMAQI
25th Oct 2025263 AMAQI
14°C10/20°C
7 AM
12 PM
6 PM
12 AM
6 AM
--°C/°C
Day time
Avg. Highest Time
12 PM - 4 PM
35AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
7 AM - 8 AM
29AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 PM to 4 PM (Avg. 35), while the lowest AQI was between 7 AM to 8 AM (Avg. 29).
Night time
Avg. Highest Time
12 AM - 2 AM
37AQI
3 hours / Day
90 hours / Month
Avg. Lowest Time
6 AM
30AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 2 AM (Avg. 37), while the lowest AQI was between 6 AM to 6 AM (Avg. 30).
2025 Days Vs Air Quality
Eureka, California, United States
2025
96%
284
4%
13
Total number of days with different AQI categories in last 298 days in 2025 (67 days remaining)
Good
284 DaysModerate
13 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 96%
Health Risk Level:
Very Low
In 2025, 96% of 298 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.
-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
36AQI
36AQI
2nd January 2025
33AQI
33AQI
3rd January 2025
34AQI
34AQI
4th January 2025
24AQI
24AQI
5th January 2025
31AQI
31AQI
6th January 2025
28AQI
28AQI
7th January 2025
23AQI
23AQI
8th January 2025
33AQI
33AQI
9th January 2025
37AQI
37AQI
10th January 2025
46AQI
46AQI
11th January 2025
28AQI
28AQI
12th January 2025
27AQI
27AQI
13th January 2025
28AQI
28AQI
14th January 2025
44AQI
44AQI
15th January 2025
52AQI
52AQI
16th January 2025
50AQI
50AQI
17th January 2025
43AQI
43AQI
18th January 2025
43AQI
43AQI
19th January 2025
52AQI
52AQI
20th January 2025
41AQI
41AQI
21st January 2025
52AQI
52AQI
22nd January 2025
56AQI
56AQI
23rd January 2025
51AQI
51AQI
24th January 2025
53AQI
53AQI
25th January 2025
38AQI
38AQI
26th January 2025
38AQI
38AQI
27th January 2025
43AQI
43AQI
28th January 2025
54AQI
54AQI
29th January 2025
64AQI
64AQI
30th January 2025
66AQI
66AQI
31st January 2025
49AQI
49AQI
1st February 2025
34AQI
34AQI
2nd February 2025
31AQI
31AQI
3rd February 2025
31AQI
31AQI
4th February 2025
30AQI
30AQI
5th February 2025
31AQI
31AQI
6th February 2025
41AQI
41AQI
7th February 2025
31AQI
31AQI
8th February 2025
36AQI
36AQI
9th February 2025
33AQI
33AQI
10th February 2025
27AQI
27AQI
11th February 2025
41AQI
41AQI
12th February 2025
49AQI
49AQI
13th February 2025
34AQI
34AQI
14th February 2025
28AQI
28AQI
15th February 2025
34AQI
34AQI
16th February 2025
33AQI
33AQI
17th February 2025
35AQI
35AQI
18th February 2025
39AQI
39AQI
19th February 2025
29AQI
29AQI
20th February 2025
28AQI
28AQI
21st February 2025
36AQI
36AQI
22nd February 2025
50AQI
50AQI
23rd February 2025
34AQI
34AQI
24th February 2025
31AQI
31AQI
25th February 2025
30AQI
30AQI
26th February 2025
38AQI
38AQI
27th February 2025
44AQI
44AQI
28th February 2025
45AQI
45AQI
1st March 2025
40AQI
40AQI
2nd March 2025
27AQI
27AQI
3rd March 2025
29AQI
29AQI
4th March 2025
29AQI
29AQI
5th March 2025
34AQI
34AQI
6th March 2025
22AQI
22AQI
7th March 2025
30AQI
30AQI
8th March 2025
38AQI
38AQI
9th March 2025
27AQI
27AQI
10th March 2025
35AQI
35AQI
11th March 2025
38AQI
38AQI
12th March 2025
27AQI
27AQI
13th March 2025
25AQI
25AQI
14th March 2025
25AQI
25AQI
15th March 2025
26AQI
26AQI
16th March 2025
30AQI
30AQI
17th March 2025
23AQI
23AQI
18th March 2025
26AQI
26AQI
19th March 2025
30AQI
30AQI
20th March 2025
21AQI
21AQI
21st March 2025
23AQI
23AQI
22nd March 2025
23AQI
23AQI
23rd March 2025
30AQI
30AQI
24th March 2025
31AQI
31AQI
25th March 2025
36AQI
36AQI
26th March 2025
32AQI
32AQI
27th March 2025
23AQI
23AQI
28th March 2025
27AQI
27AQI
29th March 2025
24AQI
24AQI
30th March 2025
30AQI
30AQI
31st March 2025
24AQI
24AQI
1st April 2025
22AQI
22AQI
2nd April 2025
22AQI
22AQI
3rd April 2025
25AQI
25AQI
4th April 2025
24AQI
24AQI
5th April 2025
27AQI
27AQI
6th April 2025
25AQI
25AQI
7th April 2025
17AQI
17AQI
8th April 2025
20AQI
20AQI
9th April 2025
27AQI
27AQI
10th April 2025
23AQI
23AQI
11th April 2025
27AQI
27AQI
12th April 2025
26AQI
26AQI
13th April 2025
29AQI
29AQI
14th April 2025
31AQI
31AQI
15th April 2025
37AQI
37AQI
16th April 2025
37AQI
37AQI
17th April 2025
32AQI
32AQI
18th April 2025
33AQI
33AQI
19th April 2025
37AQI
37AQI
20th April 2025
39AQI
39AQI
21st April 2025
33AQI
33AQI
22nd April 2025
38AQI
38AQI
23rd April 2025
43AQI
43AQI
24th April 2025
43AQI
43AQI
25th April 2025
26AQI
26AQI
26th April 2025
31AQI
31AQI
27th April 2025
24AQI
24AQI
28th April 2025
23AQI
23AQI
29th April 2025
27AQI
27AQI
30th April 2025
32AQI
32AQI
1st May 2025
30AQI
30AQI
2nd May 2025
32AQI
32AQI
3rd May 2025
24AQI
24AQI
4th May 2025
27AQI
27AQI
5th May 2025
28AQI
28AQI
6th May 2025
30AQI
30AQI
7th May 2025
33AQI
33AQI
8th May 2025
30AQI
30AQI
9th May 2025
31AQI
31AQI
10th May 2025
23AQI
23AQI
11th May 2025
21AQI
21AQI
12th May 2025
19AQI
19AQI
13th May 2025
20AQI
20AQI
14th May 2025
23AQI
23AQI
15th May 2025
24AQI
24AQI
16th May 2025
25AQI
25AQI
17th May 2025
26AQI
26AQI
18th May 2025
24AQI
24AQI
19th May 2025
23AQI
23AQI
20th May 2025
20AQI
20AQI
21st May 2025
30AQI
30AQI
22nd May 2025
27AQI
27AQI
23rd May 2025
22AQI
22AQI
24th May 2025
29AQI
29AQI
25th May 2025
27AQI
27AQI
26th May 2025
20AQI
20AQI
27th May 2025
27AQI
27AQI
28th May 2025
33AQI
33AQI
29th May 2025
25AQI
25AQI
30th May 2025
33AQI
33AQI
31st May 2025
35AQI
35AQI
1st June 2025
42AQI
42AQI
2nd June 2025
48AQI
48AQI
3rd June 2025
47AQI
47AQI
4th June 2025
36AQI
36AQI
5th June 2025
38AQI
38AQI
6th June 2025
35AQI
35AQI
7th June 2025
27AQI
27AQI
8th June 2025
26AQI
26AQI
9th June 2025
27AQI
27AQI
10th June 2025
31AQI
31AQI
11th June 2025
37AQI
37AQI
12th June 2025
42AQI
42AQI
13th June 2025
43AQI
43AQI
14th June 2025
39AQI
39AQI
15th June 2025
36AQI
36AQI
16th June 2025
28AQI
28AQI
17th June 2025
20AQI
20AQI
18th June 2025
22AQI
22AQI
19th June 2025
31AQI
31AQI
20th June 2025
34AQI
34AQI
21st June 2025
20AQI
20AQI
22nd June 2025
18AQI
18AQI
23rd June 2025
20AQI
20AQI
24th June 2025
23AQI
23AQI
25th June 2025
27AQI
27AQI
26th June 2025
23AQI
23AQI
27th June 2025
26AQI
26AQI
28th June 2025
27AQI
27AQI
29th June 2025
33AQI
33AQI
30th June 2025
34AQI
34AQI
1st July 2025
31AQI
31AQI
2nd July 2025
30AQI
30AQI
3rd July 2025
23AQI
23AQI
4th July 2025
28AQI
28AQI
5th July 2025
39AQI
39AQI
6th July 2025
33AQI
33AQI
7th July 2025
30AQI
30AQI
8th July 2025
26AQI
26AQI
9th July 2025
24AQI
24AQI
10th July 2025
32AQI
32AQI
11th July 2025
48AQI
48AQI
12th July 2025
40AQI
40AQI
13th July 2025
34AQI
34AQI
14th July 2025
35AQI
35AQI
15th July 2025
39AQI
39AQI
16th July 2025
31AQI
31AQI
17th July 2025
29AQI
29AQI
18th July 2025
27AQI
27AQI
19th July 2025
32AQI
32AQI
20th July 2025
28AQI
28AQI
21st July 2025
32AQI
32AQI
22nd July 2025
24AQI
24AQI
23rd July 2025
23AQI
23AQI
24th July 2025
20AQI
20AQI
25th July 2025
21AQI
21AQI
26th July 2025
19AQI
19AQI
27th July 2025
21AQI
21AQI
28th July 2025
27AQI
27AQI
29th July 2025
28AQI
28AQI
30th July 2025
29AQI
29AQI
31st July 2025
26AQI
26AQI
1st August 2025
23AQI
23AQI
2nd August 2025
23AQI
23AQI
3rd August 2025
30AQI
30AQI
4th August 2025
30AQI
30AQI
5th August 2025
29AQI
29AQI
6th August 2025
26AQI
26AQI
7th August 2025
25AQI
25AQI
8th August 2025
32AQI
32AQI
9th August 2025
37AQI
37AQI
10th August 2025
33AQI
33AQI
11th August 2025
27AQI
27AQI
12th August 2025
27AQI
27AQI
13th August 2025
26AQI
26AQI
14th August 2025
21AQI
21AQI
15th August 2025
26AQI
26AQI
16th August 2025
18AQI
18AQI
17th August 2025
19AQI
19AQI
18th August 2025
21AQI
21AQI
19th August 2025
24AQI
24AQI
20th August 2025
24AQI
24AQI
21st August 2025
31AQI
31AQI
22nd August 2025
38AQI
38AQI
23rd August 2025
39AQI
39AQI
24th August 2025
28AQI
28AQI
25th August 2025
26AQI
26AQI
26th August 2025
32AQI
32AQI
27th August 2025
28AQI
28AQI
28th August 2025
25AQI
25AQI
29th August 2025
27AQI
27AQI
30th August 2025
28AQI
28AQI
31st August 2025
25AQI
25AQI
1st September 2025
22AQI
22AQI
2nd September 2025
27AQI
27AQI
3rd September 2025
29AQI
29AQI
4th September 2025
35AQI
35AQI
5th September 2025
22AQI
22AQI
6th September 2025
24AQI
24AQI
7th September 2025
31AQI
31AQI
8th September 2025
25AQI
25AQI
9th September 2025
18AQI
18AQI
10th September 2025
22AQI
22AQI
11th September 2025
24AQI
24AQI
12th September 2025
25AQI
25AQI
13th September 2025
26AQI
26AQI
14th September 2025
23AQI
23AQI
15th September 2025
28AQI
28AQI
16th September 2025
37AQI
37AQI
17th September 2025
34AQI
34AQI
18th September 2025
36AQI
36AQI
19th September 2025
45AQI
45AQI
20th September 2025
39AQI
39AQI
21st September 2025
34AQI
34AQI
22nd September 2025
34AQI
34AQI
23rd September 2025
39AQI
39AQI
24th September 2025
49AQI
49AQI
25th September 2025
40AQI
40AQI
26th September 2025
27AQI
27AQI
27th September 2025
36AQI
36AQI
28th September 2025
60AQI
60AQI
29th September 2025
47AQI
47AQI
30th September 2025
20AQI
20AQI
1st October 2025
29AQI
29AQI
2nd October 2025
26AQI
26AQI
3rd October 2025
20AQI
20AQI
4th October 2025
21AQI
21AQI
5th October 2025
19AQI
19AQI
6th October 2025
16AQI
16AQI
7th October 2025
29AQI
29AQI
8th October 2025
30AQI
30AQI
9th October 2025
25AQI
25AQI
10th October 2025
22AQI
22AQI
11th October 2025
14AQI
14AQI
12th October 2025
31AQI
31AQI
13th October 2025
17AQI
17AQI
14th October 2025
25AQI
25AQI
15th October 2025
42AQI
42AQI
16th October 2025
41AQI
41AQI
17th October 2025
47AQI
47AQI
18th October 2025
45AQI
45AQI
19th October 2025
32AQI
32AQI
20th October 2025
45AQI
45AQI
21st October 2025
61AQI
61AQI
22nd October 2025
60AQI
60AQI
23rd October 2025
51AQI
51AQI
24th October 2025
43AQI
43AQI
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025
42AQI
35AQI
29AQI
29AQI
26AQI
31AQI
29AQI
27AQI
32AQI
33AQI
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
31
29
1
21
3
284
13
Highest AQI recorded in
January42AQI
Lowest AQI recorded in
May26AQI
202434AQI
16
1
2
12
29
31
31
27
1
28
3
24
6
19
12
218
24
Highest AQI recorded in
April55AQI
Lowest AQI recorded in
May22AQI
202344AQI
3
30
1
33
1
Highest AQI recorded in
November47AQI
Lowest AQI recorded in
December44AQI
202137AQI
2
9
2
17
2
28
4
Highest AQI recorded in
August43AQI
Lowest AQI recorded in
July13AQI
202078AQI
1
1
Highest AQI recorded in
October78AQI
Lowest AQI recorded in
October78AQI
Most & Least Polluted Years Over the Last 5 Years
Most Polluted Year Recorded
2020(Avg.)
78AQILeast Polluted Year Recorded
2025(Avg.)
31AQIEureka's annual 2025 AQI (31) shows an average percentage change of -27.7% (improved AQI) compared to previous years: 2020 (78), 2021 (37), 2023 (44), 2024 (34).
