Half Moon Bay, 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
Half Moon Bay, California, United States
2021
2022
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
6th Aug 2021
203AQILowest AQI recorded on
2nd Aug 2025
19AQISame Day Analysis (12th August ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 2nd highest AQI at 28 of Good air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 12th Aug - 13th Aug 2025
Half Moon Bay, California, United States
AQI
Day
Night
.
6 AM12th Aug 2025
8 PM
5 AM13th Aug 2025
Day time
Avg. Highest Time
6PM12th Aug
35AQI
Avg. Lowest Time
9AM12th Aug
21AQI
Night time
Avg. Highest Time
9PM12th Aug
34AQI
Avg. Lowest Time
5AM13th Aug
22AQI
In the last 24 hours,
Half Moon Bay's AQI reached its highest point of 35 at 6 PM during the Day, while the lowest point, 21, was recorded at 9 AM during the Day between 12th Aug and 13th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Half Moon Bay, California, United States
JulAug
14th - 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 - 12th12th - 13th13th
Day
Night
14th Jul 2025166 AMAQI
14th Jul 2025207 AMAQI
14th Jul 2025188 AMAQI
14th Jul 2025169 AMAQI
14th Jul 20251610 AMAQI
14th Jul 20251511 AMAQI
14th Jul 20251612 PMAQI
14th Jul 2025181 PMAQI
14th Jul 2025192 PMAQI
14th Jul 2025173 PMAQI
14th Jul 2025164 PMAQI
14th Jul 2025175 PMAQI
14th Jul 2025176 PMAQI
14th Jul 2025187 PMAQI
14th Jul 2025188 PMAQI
14th Jul 2025189 PMAQI
14th Jul 20252010 PMAQI
14th Jul 20251911 PMAQI
15th Jul 20251812 AMAQI
15th Jul 2025181 AMAQI
15th Jul 2025172 AMAQI
15th Jul 2025173 AMAQI
15th Jul 2025144 AMAQI
15th Jul 2025145 AMAQI
15°C11/19°C
15th Jul 2025146 AMAQI
15th Jul 2025147 AMAQI
15th Jul 2025148 AMAQI
15th Jul 2025149 AMAQI
15th Jul 20251510 AMAQI
15th Jul 20251511 AMAQI
15th Jul 20251712 PMAQI
15th Jul 2025171 PMAQI
15th Jul 2025162 PMAQI
15th Jul 2025163 PMAQI
15th Jul 2025174 PMAQI
15th Jul 2025175 PMAQI
15th Jul 2025186 PMAQI
15th Jul 2025177 PMAQI
15th Jul 2025188 PMAQI
15th Jul 2025219 PMAQI
15th Jul 20252510 PMAQI
15th Jul 20252411 PMAQI
16th Jul 20252412 AMAQI
16th Jul 2025251 AMAQI
16th Jul 2025232 AMAQI
16th Jul 2025223 AMAQI
16th Jul 2025214 AMAQI
16th Jul 2025175 AMAQI
14°C12/17°C
16th Jul 2025166 AMAQI
16th Jul 2025167 AMAQI
16th Jul 2025178 AMAQI
16th Jul 2025169 AMAQI
16th Jul 20251710 AMAQI
16th Jul 20251811 AMAQI
16th Jul 20251612 PMAQI
16th Jul 2025171 PMAQI
16th Jul 2025172 PMAQI
16th Jul 2025183 PMAQI
16th Jul 2025204 PMAQI
16th Jul 2025215 PMAQI
16th Jul 2025216 PMAQI
16th Jul 2025187 PMAQI
16th Jul 2025168 PMAQI
16th Jul 2025179 PMAQI
16th Jul 20251710 PMAQI
16th Jul 20251911 PMAQI
17th Jul 20251912 AMAQI
17th Jul 2025191 AMAQI
17th Jul 2025182 AMAQI
17th Jul 2025193 AMAQI
17th Jul 2025164 AMAQI
17th Jul 2025165 AMAQI
15°C13/18°C
17th Jul 2025156 AMAQI
17th Jul 2025147 AMAQI
17th Jul 2025168 AMAQI
17th Jul 2025149 AMAQI
17th Jul 20251510 AMAQI
17th Jul 20251411 AMAQI
17th Jul 20251412 PMAQI
17th Jul 2025151 PMAQI
17th Jul 2025152 PMAQI
17th Jul 2025183 PMAQI
17th Jul 2025184 PMAQI
17th Jul 2025185 PMAQI
17th Jul 2025186 PMAQI
17th Jul 2025177 PMAQI
17th Jul 2025188 PMAQI
17th Jul 2025189 PMAQI
17th Jul 20251810 PMAQI
17th Jul 20251911 PMAQI
18th Jul 20251912 AMAQI
18th Jul 2025181 AMAQI
18th Jul 2025182 AMAQI
18th Jul 2025163 AMAQI
18th Jul 2025144 AMAQI
18th Jul 2025155 AMAQI
15°C13/18°C
18th Jul 2025166 AMAQI
18th Jul 2025167 AMAQI
18th Jul 2025148 AMAQI
18th Jul 2025159 AMAQI
18th Jul 20251610 AMAQI
18th Jul 20251411 AMAQI
18th Jul 20251412 PMAQI
18th Jul 2025161 PMAQI
18th Jul 2025192 PMAQI
18th Jul 2025203 PMAQI
18th Jul 2025204 PMAQI
18th Jul 2025185 PMAQI
18th Jul 2025196 PMAQI
18th Jul 2025167 PMAQI
18th Jul 2025178 PMAQI
18th Jul 2025169 PMAQI
18th Jul 20251710 PMAQI
18th Jul 20251911 PMAQI
19th Jul 20251812 AMAQI
19th Jul 2025171 AMAQI
19th Jul 2025182 AMAQI
19th Jul 2025193 AMAQI
19th Jul 2025194 AMAQI
19th Jul 2025185 AMAQI
15°C14/18°C
19th Jul 2025186 AMAQI
19th Jul 2025197 AMAQI
19th Jul 2025178 AMAQI
19th Jul 2025189 AMAQI
19th Jul 20251710 AMAQI
19th Jul 20251611 AMAQI
19th Jul 20251612 PMAQI
19th Jul 2025161 PMAQI
19th Jul 2025172 PMAQI
19th Jul 2025183 PMAQI
19th Jul 2025184 PMAQI
19th Jul 2025185 PMAQI
19th Jul 2025186 PMAQI
19th Jul 2025187 PMAQI
19th Jul 2025188 PMAQI
19th Jul 2025179 PMAQI
19th Jul 20251810 PMAQI
19th Jul 20251911 PMAQI
20th Jul 20252012 AMAQI
20th Jul 2025201 AMAQI
20th Jul 2025222 AMAQI
20th Jul 2025213 AMAQI
20th Jul 2025194 AMAQI
20th Jul 2025165 AMAQI
14°C13/18°C
20th Jul 2025166 AMAQI
20th Jul 2025177 AMAQI
20th Jul 2025188 AMAQI
20th Jul 2025189 AMAQI
20th Jul 20251810 AMAQI
20th Jul 20251711 AMAQI
20th Jul 20251812 PMAQI
20th Jul 2025181 PMAQI
20th Jul 2025172 PMAQI
20th Jul 2025203 PMAQI
20th Jul 2025224 PMAQI
20th Jul 2025215 PMAQI
20th Jul 2025236 PMAQI
20th Jul 2025217 PMAQI
20th Jul 2025228 PMAQI
20th Jul 2025269 PMAQI
20th Jul 20252510 PMAQI
20th Jul 20252511 PMAQI
21st Jul 20252612 AMAQI
21st Jul 2025261 AMAQI
21st Jul 2025262 AMAQI
21st Jul 2025253 AMAQI
21st Jul 2025234 AMAQI
21st Jul 2025285 AMAQI
14°C12/16°C
21st Jul 2025276 AMAQI
21st Jul 2025227 AMAQI
21st Jul 2025208 AMAQI
21st Jul 2025189 AMAQI
21st Jul 20251810 AMAQI
21st Jul 20251711 AMAQI
21st Jul 20251712 PMAQI
21st Jul 2025161 PMAQI
21st Jul 2025182 PMAQI
21st Jul 2025203 PMAQI
21st Jul 2025204 PMAQI
21st Jul 2025215 PMAQI
21st Jul 2025206 PMAQI
21st Jul 2025217 PMAQI
21st Jul 2025208 PMAQI
21st Jul 2025169 PMAQI
21st Jul 20251810 PMAQI
21st Jul 20251911 PMAQI
22nd Jul 20251812 AMAQI
22nd Jul 2025161 AMAQI
22nd Jul 2025152 AMAQI
22nd Jul 2025153 AMAQI
22nd Jul 2025124 AMAQI
22nd Jul 2025125 AMAQI
15°C13/16°C
22nd Jul 2025126 AMAQI
22nd Jul 2025127 AMAQI
22nd Jul 2025138 AMAQI
22nd Jul 2025129 AMAQI
22nd Jul 20251310 AMAQI
22nd Jul 20251311 AMAQI
22nd Jul 20251212 PMAQI
22nd Jul 2025121 PMAQI
22nd Jul 2025122 PMAQI
22nd Jul 2025133 PMAQI
22nd Jul 2025124 PMAQI
22nd Jul 2025145 PMAQI
22nd Jul 2025146 PMAQI
22nd Jul 2025157 PMAQI
22nd Jul 2025168 PMAQI
22nd Jul 2025149 PMAQI
22nd Jul 20251410 PMAQI
22nd Jul 20251211 PMAQI
23rd Jul 20251412 AMAQI
23rd Jul 2025151 AMAQI
23rd Jul 2025152 AMAQI
23rd Jul 2025143 AMAQI
23rd Jul 2025124 AMAQI
23rd Jul 2025115 AMAQI
15°C14/17°C
23rd Jul 2025126 AMAQI
23rd Jul 2025127 AMAQI
23rd Jul 2025128 AMAQI
23rd Jul 2025149 AMAQI
23rd Jul 20251310 AMAQI
23rd Jul 20251511 AMAQI
23rd Jul 20251612 PMAQI
23rd Jul 2025151 PMAQI
23rd Jul 2025152 PMAQI
23rd Jul 2025143 PMAQI
23rd Jul 2025164 PMAQI
23rd Jul 2025155 PMAQI
23rd Jul 2025146 PMAQI
23rd Jul 2025167 PMAQI
23rd Jul 2025168 PMAQI
23rd Jul 2025159 PMAQI
23rd Jul 20251510 PMAQI
23rd Jul 20251511 PMAQI
24th Jul 20251512 AMAQI
24th Jul 2025151 AMAQI
24th Jul 2025142 AMAQI
24th Jul 2025143 AMAQI
24th Jul 2025144 AMAQI
24th Jul 2025135 AMAQI
15°C14/18°C
24th Jul 2025126 AMAQI
24th Jul 2025147 AMAQI
24th Jul 2025148 AMAQI
24th Jul 2025149 AMAQI
24th Jul 20251410 AMAQI
24th Jul 20251411 AMAQI
24th Jul 20251412 PMAQI
24th Jul 2025141 PMAQI
24th Jul 2025152 PMAQI
24th Jul 2025153 PMAQI
24th Jul 2025164 PMAQI
24th Jul 2025155 PMAQI
24th Jul 2025156 PMAQI
24th Jul 2025147 PMAQI
24th Jul 2025168 PMAQI
24th Jul 2025159 PMAQI
24th Jul 20251610 PMAQI
24th Jul 20251711 PMAQI
25th Jul 20251712 AMAQI
25th Jul 2025161 AMAQI
25th Jul 2025162 AMAQI
25th Jul 2025163 AMAQI
25th Jul 2025144 AMAQI
25th Jul 2025145 AMAQI
16°C14/18°C
25th Jul 2025136 AMAQI
25th Jul 2025147 AMAQI
25th Jul 2025148 AMAQI
25th Jul 2025159 AMAQI
25th Jul 20251410 AMAQI
25th Jul 20251411 AMAQI
25th Jul 20251412 PMAQI
25th Jul 2025141 PMAQI
25th Jul 2025142 PMAQI
25th Jul 2025153 PMAQI
25th Jul 2025174 PMAQI
25th Jul 2025175 PMAQI
25th Jul 2025166 PMAQI
25th Jul 2025157 PMAQI
25th Jul 2025158 PMAQI
25th Jul 2025169 PMAQI
25th Jul 20251610 PMAQI
25th Jul 20251611 PMAQI
26th Jul 20251612 AMAQI
26th Jul 2025161 AMAQI
26th Jul 2025162 AMAQI
26th Jul 2025143 AMAQI
26th Jul 2025144 AMAQI
26th Jul 2025135 AMAQI
15°C13/18°C
26th Jul 2025126 AMAQI
26th Jul 2025147 AMAQI
26th Jul 2025138 AMAQI
26th Jul 2025139 AMAQI
26th Jul 20251410 AMAQI
26th Jul 20251311 AMAQI
26th Jul 20251412 PMAQI
26th Jul 2025131 PMAQI
26th Jul 2025142 PMAQI
26th Jul 2025153 PMAQI
26th Jul 2025144 PMAQI
26th Jul 2025145 PMAQI
26th Jul 2025166 PMAQI
26th Jul 2025167 PMAQI
26th Jul 2025168 PMAQI
26th Jul 2025149 PMAQI
26th Jul 20251410 PMAQI
26th Jul 20251411 PMAQI
27th Jul 20251512 AMAQI
27th Jul 2025141 AMAQI
27th Jul 2025152 AMAQI
27th Jul 2025153 AMAQI
27th Jul 2025144 AMAQI
27th Jul 2025145 AMAQI
15°C14/18°C
27th Jul 2025146 AMAQI
27th Jul 2025157 AMAQI
27th Jul 2025148 AMAQI
27th Jul 2025149 AMAQI
27th Jul 20251410 AMAQI
27th Jul 20251411 AMAQI
27th Jul 20251412 PMAQI
27th Jul 2025141 PMAQI
27th Jul 2025142 PMAQI
27th Jul 2025153 PMAQI
27th Jul 2025154 PMAQI
27th Jul 2025155 PMAQI
27th Jul 2025166 PMAQI
27th Jul 2025167 PMAQI
27th Jul 2025158 PMAQI
27th Jul 2025169 PMAQI
27th Jul 20251710 PMAQI
27th Jul 20251711 PMAQI
28th Jul 20251812 AMAQI
28th Jul 2025171 AMAQI
28th Jul 2025162 AMAQI
28th Jul 2025163 AMAQI
28th Jul 2025154 AMAQI
28th Jul 2025145 AMAQI
15°C14/16°C
28th Jul 2025156 AMAQI
28th Jul 2025177 AMAQI
28th Jul 2025178 AMAQI
28th Jul 2025169 AMAQI
28th Jul 20251610 AMAQI
28th Jul 20251811 AMAQI
28th Jul 20251912 PMAQI
28th Jul 2025221 PMAQI
28th Jul 2025182 PMAQI
28th Jul 2025183 PMAQI
28th Jul 2025194 PMAQI
28th Jul 2025215 PMAQI
28th Jul 2025206 PMAQI
28th Jul 2025207 PMAQI
28th Jul 2025198 PMAQI
28th Jul 2025209 PMAQI
28th Jul 20252110 PMAQI
28th Jul 20252011 PMAQI
29th Jul 20251812 AMAQI
29th Jul 2025181 AMAQI
29th Jul 2025202 AMAQI
29th Jul 2025213 AMAQI
29th Jul 2025204 AMAQI
29th Jul 2025205 AMAQI
16°C13/19°C
29th Jul 2025206 AMAQI
29th Jul 2025227 AMAQI
29th Jul 2025208 AMAQI
29th Jul 2025199 AMAQI
29th Jul 20252310 AMAQI
29th Jul 20252111 AMAQI
29th Jul 20252212 PMAQI
29th Jul 2025271 PMAQI
29th Jul 2025252 PMAQI
29th Jul 2025243 PMAQI
29th Jul 2025254 PMAQI
29th Jul 2025265 PMAQI
29th Jul 2025286 PMAQI
29th Jul 2025267 PMAQI
29th Jul 2025238 PMAQI
29th Jul 2025229 PMAQI
29th Jul 20252310 PMAQI
29th Jul 20252311 PMAQI
30th Jul 20252412 AMAQI
30th Jul 2025241 AMAQI
30th Jul 2025232 AMAQI
30th Jul 2025213 AMAQI
30th Jul 2025184 AMAQI
30th Jul 2025195 AMAQI
14°C13/16°C
30th Jul 2025206 AMAQI
30th Jul 2025227 AMAQI
30th Jul 2025218 AMAQI
30th Jul 2025189 AMAQI
30th Jul 20251810 AMAQI
30th Jul 20251911 AMAQI
30th Jul 20251912 PMAQI
30th Jul 2025221 PMAQI
30th Jul 2025222 PMAQI
30th Jul 2025223 PMAQI
30th Jul 2025224 PMAQI
30th Jul 2025225 PMAQI
30th Jul 2025226 PMAQI
30th Jul 2025227 PMAQI
30th Jul 2025228 PMAQI
30th Jul 2025239 PMAQI
30th Jul 20252410 PMAQI
30th Jul 20252411 PMAQI
31st Jul 20252212 AMAQI
31st Jul 2025221 AMAQI
31st Jul 2025222 AMAQI
31st Jul 2025223 AMAQI
31st Jul 2025164 AMAQI
31st Jul 2025155 AMAQI
15°C13/16°C
31st Jul 2025186 AMAQI
31st Jul 2025227 AMAQI
31st Jul 2025208 AMAQI
31st Jul 2025189 AMAQI
31st Jul 20251810 AMAQI
31st Jul 20251911 AMAQI
31st Jul 20252112 PMAQI
31st Jul 2025191 PMAQI
31st Jul 2025222 PMAQI
31st Jul 2025233 PMAQI
31st Jul 2025254 PMAQI
31st Jul 2025255 PMAQI
31st Jul 2025246 PMAQI
31st Jul 2025227 PMAQI
31st Jul 2025248 PMAQI
31st Jul 2025279 PMAQI
31st Jul 20252610 PMAQI
31st Jul 20252711 PMAQI
1st Aug 20252912 AMAQI
1st Aug 2025241 AMAQI
1st Aug 2025212 AMAQI
1st Aug 2025203 AMAQI
1st Aug 2025204 AMAQI
1st Aug 2025215 AMAQI
16°C14/19°C
1st Aug 2025196 AMAQI
1st Aug 2025177 AMAQI
1st Aug 2025188 AMAQI
1st Aug 2025189 AMAQI
1st Aug 20251610 AMAQI
1st Aug 20251811 AMAQI
1st Aug 20252012 PMAQI
1st Aug 2025201 PMAQI
1st Aug 2025202 PMAQI
1st Aug 2025223 PMAQI
1st Aug 2025254 PMAQI
1st Aug 2025275 PMAQI
1st Aug 2025276 PMAQI
1st Aug 2025207 PMAQI
1st Aug 2025248 PMAQI
1st Aug 2025249 PMAQI
1st Aug 20252610 PMAQI
1st Aug 20252811 PMAQI
2nd Aug 20252712 AMAQI
2nd Aug 2025241 AMAQI
2nd Aug 2025222 AMAQI
2nd Aug 2025223 AMAQI
2nd Aug 2025204 AMAQI
2nd Aug 2025195 AMAQI
15°C13/18°C
2nd Aug 2025206 AMAQI
2nd Aug 2025187 AMAQI
2nd Aug 2025178 AMAQI
2nd Aug 2025169 AMAQI
2nd Aug 20251610 AMAQI
2nd Aug 20251711 AMAQI
2nd Aug 20251712 PMAQI
2nd Aug 2025161 PMAQI
2nd Aug 2025152 PMAQI
2nd Aug 2025183 PMAQI
2nd Aug 2025184 PMAQI
2nd Aug 2025205 PMAQI
2nd Aug 2025206 PMAQI
2nd Aug 2025197 PMAQI
2nd Aug 2025188 PMAQI
2nd Aug 2025179 PMAQI
2nd Aug 20251810 PMAQI
2nd Aug 20251811 PMAQI
3rd Aug 20252412 AMAQI
3rd Aug 2025261 AMAQI
3rd Aug 2025272 AMAQI
3rd Aug 2025263 AMAQI
3rd Aug 2025224 AMAQI
3rd Aug 2025205 AMAQI
15°C13/18°C
3rd Aug 2025216 AMAQI
3rd Aug 2025227 AMAQI
3rd Aug 2025258 AMAQI
3rd Aug 2025219 AMAQI
3rd Aug 20252110 AMAQI
3rd Aug 20252311 AMAQI
3rd Aug 20252612 PMAQI
3rd Aug 2025281 PMAQI
3rd Aug 2025332 PMAQI
3rd Aug 2025383 PMAQI
3rd Aug 2025384 PMAQI
3rd Aug 2025425 PMAQI
3rd Aug 2025436 PMAQI
3rd Aug 2025267 PMAQI
3rd Aug 2025338 PMAQI
3rd Aug 2025379 PMAQI
3rd Aug 20254310 PMAQI
3rd Aug 20253911 PMAQI
4th Aug 20254012 AMAQI
4th Aug 2025361 AMAQI
4th Aug 2025342 AMAQI
4th Aug 2025313 AMAQI
4th Aug 2025334 AMAQI
4th Aug 2025335 AMAQI
15°C13/18°C
4th Aug 2025346 AMAQI
4th Aug 2025337 AMAQI
4th Aug 2025308 AMAQI
4th Aug 2025309 AMAQI
4th Aug 20253610 AMAQI
4th Aug 20253811 AMAQI
4th Aug 20253612 PMAQI
4th Aug 2025351 PMAQI
4th Aug 2025342 PMAQI
4th Aug 2025343 PMAQI
4th Aug 2025324 PMAQI
4th Aug 2025325 PMAQI
4th Aug 2025326 PMAQI
4th Aug 2025327 PMAQI
4th Aug 2025308 PMAQI
4th Aug 2025289 PMAQI
4th Aug 20252910 PMAQI
4th Aug 20252611 PMAQI
5th Aug 20252512 AMAQI
5th Aug 2025261 AMAQI
5th Aug 2025282 AMAQI
5th Aug 2025243 AMAQI
5th Aug 2025264 AMAQI
5th Aug 2025245 AMAQI
15°C13/18°C
5th Aug 2025276 AMAQI
5th Aug 2025267 AMAQI
5th Aug 2025268 AMAQI
5th Aug 2025249 AMAQI
5th Aug 20252810 AMAQI
5th Aug 20252811 AMAQI
5th Aug 20253012 PMAQI
5th Aug 2025301 PMAQI
5th Aug 2025282 PMAQI
5th Aug 2025263 PMAQI
5th Aug 2025324 PMAQI
5th Aug 2025325 PMAQI
5th Aug 2025366 PMAQI
5th Aug 2025287 PMAQI
5th Aug 2025278 PMAQI
5th Aug 2025289 PMAQI
5th Aug 20252710 PMAQI
5th Aug 20252511 PMAQI
6th Aug 20252612 AMAQI
6th Aug 2025291 AMAQI
6th Aug 2025302 AMAQI
6th Aug 2025303 AMAQI
6th Aug 2025284 AMAQI
6th Aug 2025285 AMAQI
14°C12/18°C
6th Aug 2025316 AMAQI
6th Aug 2025307 AMAQI
6th Aug 2025308 AMAQI
6th Aug 2025299 AMAQI
6th Aug 20253010 AMAQI
6th Aug 20253011 AMAQI
6th Aug 20253512 PMAQI
6th Aug 2025381 PMAQI
6th Aug 2025392 PMAQI
6th Aug 2025423 PMAQI
6th Aug 2025424 PMAQI
6th Aug 2025475 PMAQI
6th Aug 2025426 PMAQI
6th Aug 2025317 PMAQI
6th Aug 2025338 PMAQI
6th Aug 2025349 PMAQI
6th Aug 20253010 PMAQI
6th Aug 20253011 PMAQI
7th Aug 20253112 AMAQI
7th Aug 2025291 AMAQI
7th Aug 2025282 AMAQI
7th Aug 2025273 AMAQI
7th Aug 2025244 AMAQI
7th Aug 2025275 AMAQI
15°C12/21°C
7th Aug 2025286 AMAQI
7th Aug 2025267 AMAQI
7th Aug 2025248 AMAQI
7th Aug 2025239 AMAQI
7th Aug 20252210 AMAQI
7th Aug 20252511 AMAQI
7th Aug 20252212 PMAQI
7th Aug 2025201 PMAQI
7th Aug 2025202 PMAQI
7th Aug 2025213 PMAQI
7th Aug 2025224 PMAQI
7th Aug 2025225 PMAQI
7th Aug 2025246 PMAQI
7th Aug 2025267 PMAQI
7th Aug 2025238 PMAQI
7th Aug 2025209 PMAQI
7th Aug 20252010 PMAQI
7th Aug 20252111 PMAQI
8th Aug 20252412 AMAQI
8th Aug 2025261 AMAQI
8th Aug 2025272 AMAQI
8th Aug 2025263 AMAQI
8th Aug 2025274 AMAQI
8th Aug 2025225 AMAQI
15°C13/18°C
8th Aug 2025216 AMAQI
8th Aug 2025247 AMAQI
8th Aug 2025248 AMAQI
8th Aug 2025259 AMAQI
8th Aug 20252810 AMAQI
8th Aug 20253011 AMAQI
8th Aug 20253312 PMAQI
8th Aug 2025301 PMAQI
8th Aug 2025282 PMAQI
8th Aug 2025323 PMAQI
8th Aug 2025344 PMAQI
8th Aug 2025345 PMAQI
8th Aug 2025346 PMAQI
8th Aug 2025297 PMAQI
8th Aug 2025298 PMAQI
8th Aug 2025349 PMAQI
8th Aug 20253310 PMAQI
8th Aug 20253611 PMAQI
9th Aug 20253812 AMAQI
9th Aug 2025371 AMAQI
9th Aug 2025342 AMAQI
9th Aug 2025343 AMAQI
9th Aug 2025334 AMAQI
9th Aug 2025405 AMAQI
15°C12/20°C
9th Aug 2025436 AMAQI
9th Aug 2025417 AMAQI
9th Aug 2025328 AMAQI
9th Aug 2025309 AMAQI
9th Aug 20252810 AMAQI
9th Aug 20252711 AMAQI
9th Aug 20252912 PMAQI
9th Aug 2025311 PMAQI
9th Aug 2025282 PMAQI
9th Aug 2025323 PMAQI
9th Aug 2025304 PMAQI
9th Aug 2025305 PMAQI
9th Aug 2025306 PMAQI
9th Aug 2025317 PMAQI
9th Aug 2025308 PMAQI
9th Aug 2025269 PMAQI
9th Aug 20252510 PMAQI
9th Aug 20252611 PMAQI
10th Aug 20253012 AMAQI
10th Aug 2025291 AMAQI
10th Aug 2025282 AMAQI
10th Aug 2025283 AMAQI
10th Aug 2025284 AMAQI
10th Aug 2025265 AMAQI
17°C13/21°C
10th Aug 2025286 AMAQI
10th Aug 2025327 AMAQI
10th Aug 2025208 AMAQI
10th Aug 2025229 AMAQI
10th Aug 20252210 AMAQI
10th Aug 20252211 AMAQI
10th Aug 20252412 PMAQI
10th Aug 2025251 PMAQI
10th Aug 2025242 PMAQI
10th Aug 2025273 PMAQI
10th Aug 2025254 PMAQI
10th Aug 2025245 PMAQI
10th Aug 2025266 PMAQI
10th Aug 2025257 PMAQI
10th Aug 2025268 PMAQI
10th Aug 2025269 PMAQI
10th Aug 20252610 PMAQI
10th Aug 20252411 PMAQI
11th Aug 20252512 AMAQI
11th Aug 2025321 AMAQI
11th Aug 2025242 AMAQI
11th Aug 2025233 AMAQI
11th Aug 2025254 AMAQI
11th Aug 2025255 AMAQI
16°C13/21°C
11th Aug 2025246 AMAQI
11th Aug 2025207 AMAQI
11th Aug 2025228 AMAQI
11th Aug 2025219 AMAQI
11th Aug 20252610 AMAQI
11th Aug 20252411 AMAQI
11th Aug 20252612 PMAQI
11th Aug 2025261 PMAQI
11th Aug 2025262 PMAQI
11th Aug 2025303 PMAQI
11th Aug 2025324 PMAQI
11th Aug 2025345 PMAQI
11th Aug 2025346 PMAQI
11th Aug 2025267 PMAQI
11th Aug 2025318 PMAQI
11th Aug 2025349 PMAQI
11th Aug 20253410 PMAQI
11th Aug 20253011 PMAQI
12th Aug 20252812 AMAQI
12th Aug 2025261 AMAQI
12th Aug 2025242 AMAQI
12th Aug 2025233 AMAQI
12th Aug 2025244 AMAQI
12th Aug 2025255 AMAQI
14°C12/19°C
12th Aug 2025266 AMAQI
12th Aug 2025247 AMAQI
12th Aug 2025248 AMAQI
12th Aug 2025219 AMAQI
12th Aug 20252310 AMAQI
12th Aug 20252511 AMAQI
12th Aug 20252512 PMAQI
12th Aug 2025251 PMAQI
12th Aug 2025262 PMAQI
12th Aug 2025303 PMAQI
12th Aug 2025324 PMAQI
12th Aug 2025335 PMAQI
12th Aug 2025356 PMAQI
12th Aug 2025297 PMAQI
12th Aug 2025338 PMAQI
12th Aug 2025349 PMAQI
12th Aug 20253210 PMAQI
12th Aug 20253011 PMAQI
13th Aug 20252712 AMAQI
13th Aug 2025241 AMAQI
13th Aug 2025222 AMAQI
13th Aug 2025223 AMAQI
13th Aug 2025224 AMAQI
13th Aug 2025225 AMAQI
15°C13/19°C
13th Aug 2025216 AMAQI
6 AM13th Aug 2025207 AMAQI
13th Aug 2025198 AMAQI
13th Aug 2025209 AMAQI
13th Aug 20251810 AMAQI
13th Aug 20252111 AMAQI
13th Aug 20252112 PMAQI
13th Aug 2025201 PMAQI
1 PM13th Aug 2025232 PMAQI
8 PM
1 AM
5 AM
--°C/°C
Day time
Avg. Highest Time
6 AM - 6 PM
21AQI
13 hours / Day
390 hours / Month
Avg. Lowest Time
8 AM - 10 AM
19AQI
3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 6 AM to 6 PM (Avg. 21), while the lowest AQI was between 8 AM to 10 AM (Avg. 19).
Night time
Avg. Highest Time
12 AM - 11 PM
22AQI
9 hours / Day
270 hours / Month
Avg. Lowest Time
12 AM - 5 AM
22AQI
6 hours / Day
180 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 22), while the lowest AQI was between 12 AM to 5 AM (Avg. 22).
2025 Days Vs Air Quality
Half Moon Bay, California, United States
2025
98%
220
2%
4
Total number of days with different AQI categories in last 225 days in 2025 (140 days remaining)
Good
220 DaysModerate
4 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2025, 98% of 225 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
Half Moon Bay, 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
48AQI
48AQI
2nd January 2025
42AQI
42AQI
3rd January 2025
42AQI
42AQI
4th January 2025
34AQI
34AQI
5th January 2025
33AQI
33AQI
6th January 2025
31AQI
31AQI
7th January 2025
25AQI
25AQI
8th January 2025
26AQI
26AQI
9th January 2025
36AQI
36AQI
10th January 2025
41AQI
41AQI
11th January 2025
36AQI
36AQI
12th January 2025
26AQI
26AQI
13th January 2025
34AQI
34AQI
14th January 2025
31AQI
31AQI
15th January 2025
44AQI
44AQI
16th January 2025
49AQI
49AQI
17th January 2025
45AQI
45AQI
18th January 2025
51AQI
51AQI
19th January 2025
51AQI
51AQI
20th January 2025
43AQI
43AQI
21st January 2025
42AQI
42AQI
22nd January 2025
47AQI
47AQI
23rd January 2025
46AQI
46AQI
24th January 2025
56AQI
56AQI
25th January 2025
46AQI
46AQI
26th January 2025
43AQI
43AQI
27th January 2025
42AQI
42AQI
28th January 2025
40AQI
40AQI
29th January 2025
37AQI
37AQI
30th January 2025
38AQI
38AQI
31st January 2025
37AQI
37AQI
1st February 2025
34AQI
34AQI
2nd February 2025
22AQI
22AQI
3rd February 2025
22AQI
22AQI
4th February 2025
23AQI
23AQI
5th February 2025
29AQI
29AQI
6th February 2025
26AQI
26AQI
7th February 2025
25AQI
25AQI
8th February 2025
25AQI
25AQI
9th February 2025
29AQI
29AQI
10th February 2025
28AQI
28AQI
11th February 2025
27AQI
27AQI
12th February 2025
24AQI
24AQI
13th February 2025
26AQI
26AQI
14th February 2025
31AQI
31AQI
15th February 2025
31AQI
31AQI
16th February 2025
26AQI
26AQI
17th February 2025
23AQI
23AQI
18th February 2025
24AQI
24AQI
19th February 2025
25AQI
25AQI
20th February 2025
25AQI
25AQI
21st February 2025
27AQI
27AQI
22nd February 2025
30AQI
30AQI
23rd February 2025
33AQI
33AQI
24th February 2025
26AQI
26AQI
25th February 2025
26AQI
26AQI
26th February 2025
28AQI
28AQI
27th February 2025
32AQI
32AQI
28th February 2025
40AQI
40AQI
1st March 2025
33AQI
33AQI
2nd March 2025
27AQI
27AQI
3rd March 2025
23AQI
23AQI
4th March 2025
25AQI
25AQI
5th March 2025
25AQI
25AQI
6th March 2025
26AQI
26AQI
7th March 2025
31AQI
31AQI
8th March 2025
31AQI
31AQI
9th March 2025
33AQI
33AQI
10th March 2025
28AQI
28AQI
11th March 2025
28AQI
28AQI
12th March 2025
27AQI
27AQI
13th March 2025
24AQI
24AQI
14th March 2025
31AQI
31AQI
15th March 2025
53AQI
53AQI
16th March 2025
33AQI
33AQI
17th March 2025
20AQI
20AQI
18th March 2025
24AQI
24AQI
19th March 2025
32AQI
32AQI
20th March 2025
26AQI
26AQI
21st March 2025
23AQI
23AQI
22nd March 2025
24AQI
24AQI
23rd March 2025
34AQI
34AQI
24th March 2025
25AQI
25AQI
25th March 2025
29AQI
29AQI
26th March 2025
33AQI
33AQI
27th March 2025
19AQI
19AQI
28th March 2025
23AQI
23AQI
29th March 2025
19AQI
19AQI
30th March 2025
28AQI
28AQI
31st March 2025
24AQI
24AQI
1st April 2025
24AQI
24AQI
2nd April 2025
22AQI
22AQI
3rd April 2025
20AQI
20AQI
4th April 2025
27AQI
27AQI
5th April 2025
26AQI
26AQI
6th April 2025
19AQI
19AQI
7th April 2025
17AQI
17AQI
8th April 2025
30AQI
30AQI
9th April 2025
21AQI
21AQI
10th April 2025
21AQI
21AQI
11th April 2025
19AQI
19AQI
12th April 2025
28AQI
28AQI
13th April 2025
36AQI
36AQI
14th April 2025
29AQI
29AQI
15th April 2025
27AQI
27AQI
16th April 2025
28AQI
28AQI
17th April 2025
23AQI
23AQI
18th April 2025
26AQI
26AQI
19th April 2025
29AQI
29AQI
20th April 2025
25AQI
25AQI
21st April 2025
30AQI
30AQI
22nd April 2025
34AQI
34AQI
23rd April 2025
41AQI
41AQI
24th April 2025
30AQI
30AQI
25th April 2025
19AQI
19AQI
26th April 2025
20AQI
20AQI
27th April 2025
21AQI
21AQI
28th April 2025
28AQI
28AQI
29th April 2025
32AQI
32AQI
30th April 2025
37AQI
37AQI
1st May 2025
36AQI
36AQI
2nd May 2025
28AQI
28AQI
3rd May 2025
23AQI
23AQI
4th May 2025
36AQI
36AQI
5th May 2025
36AQI
36AQI
6th May 2025
49AQI
49AQI
7th May 2025
42AQI
42AQI
8th May 2025
25AQI
25AQI
9th May 2025
29AQI
29AQI
10th May 2025
27AQI
27AQI
11th May 2025
22AQI
22AQI
12th May 2025
17AQI
17AQI
13th May 2025
17AQI
17AQI
14th May 2025
32AQI
32AQI
15th May 2025
38AQI
38AQI
16th May 2025
37AQI
37AQI
17th May 2025
32AQI
32AQI
18th May 2025
35AQI
35AQI
19th May 2025
43AQI
43AQI
20th May 2025
29AQI
29AQI
21st May 2025
45AQI
45AQI
22nd May 2025
34AQI
34AQI
23rd May 2025
24AQI
24AQI
24th May 2025
27AQI
27AQI
25th May 2025
20AQI
20AQI
26th May 2025
18AQI
18AQI
27th May 2025
23AQI
23AQI
28th May 2025
23AQI
23AQI
29th May 2025
17AQI
17AQI
30th May 2025
26AQI
26AQI
31st May 2025
42AQI
42AQI
1st June 2025
49AQI
49AQI
2nd June 2025
44AQI
44AQI
3rd June 2025
40AQI
40AQI
4th June 2025
50AQI
50AQI
5th June 2025
28AQI
28AQI
6th June 2025
23AQI
23AQI
7th June 2025
20AQI
20AQI
8th June 2025
18AQI
18AQI
9th June 2025
17AQI
17AQI
10th June 2025
21AQI
21AQI
11th June 2025
36AQI
36AQI
12th June 2025
42AQI
42AQI
13th June 2025
42AQI
42AQI
14th June 2025
40AQI
40AQI
15th June 2025
41AQI
41AQI
16th June 2025
34AQI
34AQI
17th June 2025
33AQI
33AQI
18th June 2025
33AQI
33AQI
19th June 2025
40AQI
40AQI
20th June 2025
38AQI
38AQI
21st June 2025
32AQI
32AQI
22nd June 2025
33AQI
33AQI
23rd June 2025
32AQI
32AQI
24th June 2025
23AQI
23AQI
25th June 2025
20AQI
20AQI
26th June 2025
22AQI
22AQI
27th June 2025
30AQI
30AQI
28th June 2025
32AQI
32AQI
29th June 2025
25AQI
25AQI
30th June 2025
20AQI
20AQI
1st July 2025
21AQI
21AQI
2nd July 2025
21AQI
21AQI
3rd July 2025
30AQI
30AQI
4th July 2025
27AQI
27AQI
5th July 2025
29AQI
29AQI
6th July 2025
29AQI
29AQI
7th July 2025
24AQI
24AQI
8th July 2025
19AQI
19AQI
9th July 2025
17AQI
17AQI
10th July 2025
19AQI
19AQI
11th July 2025
28AQI
28AQI
12th July 2025
29AQI
29AQI
13th July 2025
25AQI
25AQI
14th July 2025
19AQI
19AQI
15th July 2025
17AQI
17AQI
16th July 2025
19AQI
19AQI
17th July 2025
17AQI
17AQI
18th July 2025
17AQI
17AQI
19th July 2025
18AQI
18AQI
20th July 2025
20AQI
20AQI
21st July 2025
21AQI
21AQI
22nd July 2025
14AQI
14AQI
23rd July 2025
14AQI
14AQI
24th July 2025
15AQI
15AQI
25th July 2025
15AQI
15AQI
26th July 2025
14AQI
14AQI
27th July 2025
15AQI
15AQI
28th July 2025
18AQI
18AQI
29th July 2025
22AQI
22AQI
30th July 2025
21AQI
21AQI
31st July 2025
22AQI
22AQI
1st August 2025
22AQI
22AQI
2nd August 2025
19AQI
19AQI
3rd August 2025
29AQI
29AQI
4th August 2025
33AQI
33AQI
5th August 2025
28AQI
28AQI
6th August 2025
33AQI
33AQI
7th August 2025
24AQI
24AQI
8th August 2025
29AQI
29AQI
9th August 2025
32AQI
32AQI
10th August 2025
26AQI
26AQI
11th August 2025
28AQI
28AQI
12th August 2025
28AQI
28AQI
40AQI
27AQI
28AQI
26AQI
30AQI
32AQI
21AQI
28AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202529AQI
28
3
28
30
1
30
31
30
31
12
220
4
Highest AQI recorded in
January40AQI
Lowest AQI recorded in
July21AQI
202433AQI
16
1
12
26
3
30
1
31
28
28
3
28
2
24
7
224
16
Highest AQI recorded in
December43AQI
Lowest AQI recorded in
March13AQI
202336AQI
2
1
24
7
26
8
Highest AQI recorded in
November48AQI
Lowest AQI recorded in
December35AQI
202231AQI
7
1
1
20
2
1
27
4
1
Highest AQI recorded in
August65AQI
Lowest AQI recorded in
September30AQI
202165AQI
11
3
6
3
12
4
1
11
12
6
1
23
4
54
19
18
5
1
Highest AQI recorded in
August113AQI
Lowest AQI recorded in
May26AQI
202064AQI
19
6
4
1
1
1
1
20
7
1
4
1
Highest AQI recorded in
October104AQI
Lowest AQI recorded in
November48AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2021(Avg.)
65AQILeast Polluted Year Recorded
2025(Avg.)
29AQIHalf Moon Bay's annual 2025 AQI (29) shows an average percentage change of -29.5% (improved AQI) compared to previous years: 2020 (64), 2021 (65), 2022 (31), 2023 (36), 2024 (33).
