Portland, Oregon, 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
Portland, Oregon, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
20th Aug 2023
86AQILowest AQI recorded on
5th Aug 2021
10AQISame Day Analysis (1st August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 18 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 1st Aug - 2nd Aug 2025
Portland, Oregon, United States
AQI
Day
Night
.
5 AM1st Aug 2025
8 PM
4 AM2nd Aug 2025
Day time
Avg. Highest Time
5AM1st Aug
32AQI
Avg. Lowest Time
6PM1st Aug
18AQI
Night time
Avg. Highest Time
12AM2nd Aug
25AQI
Avg. Lowest Time
4AM2nd Aug
19AQI
In the last 24 hours,
Portland's AQI reached its highest point of 32 at 5 AM during the Day, while the lowest point, 18, was recorded at 6 PM during the Day between 1st Aug and 2nd Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Portland, Oregon, United States
JulAug
03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd
Day
Night
3rd Jul 2025215 AMAQI
3rd Jul 2025216 AMAQI
3rd Jul 2025217 AMAQI
3rd Jul 2025248 AMAQI
3rd Jul 2025269 AMAQI
3rd Jul 20252610 AMAQI
3rd Jul 20252611 AMAQI
3rd Jul 20252612 PMAQI
3rd Jul 2025271 PMAQI
3rd Jul 2025272 PMAQI
3rd Jul 2025263 PMAQI
3rd Jul 2025254 PMAQI
3rd Jul 2025255 PMAQI
3rd Jul 2025246 PMAQI
3rd Jul 2025247 PMAQI
3rd Jul 2025248 PMAQI
3rd Jul 2025249 PMAQI
3rd Jul 20252410 PMAQI
3rd Jul 20252411 PMAQI
4th Jul 20252412 AMAQI
4th Jul 2025251 AMAQI
4th Jul 2025262 AMAQI
4th Jul 2025233 AMAQI
4th Jul 2025254 AMAQI
15°C10/22°C
4th Jul 2025245 AMAQI
4th Jul 2025256 AMAQI
4th Jul 2025257 AMAQI
4th Jul 2025248 AMAQI
4th Jul 2025229 AMAQI
4th Jul 20252010 AMAQI
4th Jul 20251911 AMAQI
4th Jul 20251912 PMAQI
4th Jul 2025181 PMAQI
4th Jul 2025182 PMAQI
4th Jul 2025213 PMAQI
4th Jul 2025204 PMAQI
4th Jul 2025215 PMAQI
4th Jul 2025216 PMAQI
4th Jul 2025227 PMAQI
4th Jul 2025228 PMAQI
4th Jul 2025229 PMAQI
4th Jul 20252510 PMAQI
4th Jul 20252611 PMAQI
5th Jul 20252612 AMAQI
5th Jul 2025271 AMAQI
5th Jul 2025282 AMAQI
5th Jul 2025293 AMAQI
5th Jul 2025304 AMAQI
15°C10/21°C
5th Jul 2025305 AMAQI
5th Jul 2025266 AMAQI
5th Jul 2025267 AMAQI
5th Jul 2025248 AMAQI
5th Jul 2025239 AMAQI
5th Jul 20252310 AMAQI
5th Jul 20252211 AMAQI
5th Jul 20252212 PMAQI
5th Jul 2025211 PMAQI
5th Jul 2025212 PMAQI
5th Jul 2025243 PMAQI
5th Jul 2025234 PMAQI
5th Jul 2025235 PMAQI
5th Jul 2025236 PMAQI
5th Jul 2025227 PMAQI
5th Jul 2025218 PMAQI
5th Jul 2025219 PMAQI
5th Jul 20252110 PMAQI
5th Jul 20252211 PMAQI
6th Jul 20252412 AMAQI
6th Jul 2025231 AMAQI
6th Jul 2025232 AMAQI
6th Jul 2025213 AMAQI
6th Jul 2025214 AMAQI
16°C9/23°C
6th Jul 2025225 AMAQI
6th Jul 2025266 AMAQI
6th Jul 2025267 AMAQI
6th Jul 2025248 AMAQI
6th Jul 2025239 AMAQI
6th Jul 20252410 AMAQI
6th Jul 20252711 AMAQI
6th Jul 20252812 PMAQI
6th Jul 2025271 PMAQI
6th Jul 2025282 PMAQI
6th Jul 2025273 PMAQI
6th Jul 2025264 PMAQI
6th Jul 2025285 PMAQI
6th Jul 2025276 PMAQI
6th Jul 2025267 PMAQI
6th Jul 2025268 PMAQI
6th Jul 2025289 PMAQI
6th Jul 20252710 PMAQI
6th Jul 20252811 PMAQI
7th Jul 20252712 AMAQI
7th Jul 2025281 AMAQI
7th Jul 2025282 AMAQI
7th Jul 2025293 AMAQI
7th Jul 2025284 AMAQI
20°C11/29°C
7th Jul 2025285 AMAQI
7th Jul 2025296 AMAQI
7th Jul 2025297 AMAQI
7th Jul 2025288 AMAQI
7th Jul 2025289 AMAQI
7th Jul 20252810 AMAQI
7th Jul 20252811 AMAQI
7th Jul 20252912 PMAQI
7th Jul 2025301 PMAQI
7th Jul 2025302 PMAQI
7th Jul 2025293 PMAQI
7th Jul 2025294 PMAQI
7th Jul 2025295 PMAQI
7th Jul 2025286 PMAQI
7th Jul 2025287 PMAQI
7th Jul 2025278 PMAQI
7th Jul 2025269 PMAQI
7th Jul 20252610 PMAQI
7th Jul 20252711 PMAQI
8th Jul 20252812 AMAQI
8th Jul 2025251 AMAQI
8th Jul 2025222 AMAQI
8th Jul 2025233 AMAQI
8th Jul 2025254 AMAQI
22°C13/31°C
8th Jul 2025245 AMAQI
8th Jul 2025256 AMAQI
8th Jul 2025257 AMAQI
8th Jul 2025268 AMAQI
8th Jul 2025269 AMAQI
8th Jul 20252610 AMAQI
8th Jul 20252711 AMAQI
8th Jul 20252712 PMAQI
8th Jul 2025281 PMAQI
8th Jul 2025302 PMAQI
8th Jul 2025283 PMAQI
8th Jul 2025284 PMAQI
8th Jul 2025285 PMAQI
8th Jul 2025286 PMAQI
8th Jul 2025267 PMAQI
8th Jul 2025268 PMAQI
8th Jul 2025269 PMAQI
8th Jul 20252610 PMAQI
8th Jul 20252511 PMAQI
9th Jul 20252412 AMAQI
9th Jul 2025221 AMAQI
9th Jul 2025192 AMAQI
9th Jul 2025193 AMAQI
9th Jul 2025174 AMAQI
20°C12/30°C
9th Jul 2025175 AMAQI
9th Jul 2025166 AMAQI
9th Jul 2025187 AMAQI
9th Jul 2025198 AMAQI
9th Jul 2025189 AMAQI
9th Jul 20251810 AMAQI
9th Jul 20251711 AMAQI
9th Jul 20251912 PMAQI
9th Jul 2025201 PMAQI
9th Jul 2025202 PMAQI
9th Jul 2025203 PMAQI
9th Jul 2025204 PMAQI
9th Jul 2025205 PMAQI
9th Jul 2025206 PMAQI
9th Jul 2025197 PMAQI
9th Jul 2025208 PMAQI
9th Jul 2025219 PMAQI
9th Jul 20252110 PMAQI
9th Jul 20252011 PMAQI
10th Jul 20252012 AMAQI
10th Jul 2025181 AMAQI
10th Jul 2025172 AMAQI
10th Jul 2025163 AMAQI
10th Jul 2025194 AMAQI
18°C15/23°C
10th Jul 2025185 AMAQI
10th Jul 2025176 AMAQI
10th Jul 2025187 AMAQI
10th Jul 2025188 AMAQI
10th Jul 2025199 AMAQI
10th Jul 20251910 AMAQI
10th Jul 20251811 AMAQI
10th Jul 20251912 PMAQI
10th Jul 2025171 PMAQI
10th Jul 2025172 PMAQI
10th Jul 2025183 PMAQI
10th Jul 2025174 PMAQI
10th Jul 2025175 PMAQI
10th Jul 2025176 PMAQI
10th Jul 2025187 PMAQI
10th Jul 2025188 PMAQI
10th Jul 2025179 PMAQI
10th Jul 20251710 PMAQI
10th Jul 20251811 PMAQI
11th Jul 20251812 AMAQI
11th Jul 2025171 AMAQI
11th Jul 2025172 AMAQI
11th Jul 2025173 AMAQI
11th Jul 2025184 AMAQI
18°C15/24°C
11th Jul 2025175 AMAQI
11th Jul 2025196 AMAQI
11th Jul 2025187 AMAQI
11th Jul 2025208 AMAQI
11th Jul 2025199 AMAQI
11th Jul 20252010 AMAQI
11th Jul 20252011 AMAQI
11th Jul 20252012 PMAQI
11th Jul 2025211 PMAQI
11th Jul 2025222 PMAQI
11th Jul 2025213 PMAQI
11th Jul 2025214 PMAQI
11th Jul 2025215 PMAQI
11th Jul 2025216 PMAQI
11th Jul 2025207 PMAQI
11th Jul 2025208 PMAQI
11th Jul 2025209 PMAQI
11th Jul 20252110 PMAQI
11th Jul 20252111 PMAQI
12th Jul 20252012 AMAQI
12th Jul 2025201 AMAQI
12th Jul 2025202 AMAQI
12th Jul 2025193 AMAQI
12th Jul 2025194 AMAQI
22°C14/30°C
12th Jul 2025195 AMAQI
12th Jul 2025176 AMAQI
12th Jul 2025187 AMAQI
12th Jul 2025208 AMAQI
12th Jul 2025199 AMAQI
12th Jul 20251910 AMAQI
12th Jul 20251911 AMAQI
12th Jul 20251912 PMAQI
12th Jul 2025211 PMAQI
12th Jul 2025212 PMAQI
12th Jul 2025213 PMAQI
12th Jul 2025214 PMAQI
12th Jul 2025205 PMAQI
12th Jul 2025196 PMAQI
12th Jul 2025197 PMAQI
12th Jul 2025218 PMAQI
12th Jul 2025209 PMAQI
12th Jul 20252110 PMAQI
12th Jul 20252011 PMAQI
13th Jul 20252012 AMAQI
13th Jul 2025211 AMAQI
13th Jul 2025202 AMAQI
13th Jul 2025193 AMAQI
13th Jul 2025224 AMAQI
21°C14/30°C
13th Jul 2025215 AMAQI
13th Jul 2025206 AMAQI
13th Jul 2025207 AMAQI
13th Jul 2025208 AMAQI
13th Jul 2025219 AMAQI
13th Jul 20252010 AMAQI
13th Jul 20252011 AMAQI
13th Jul 20252012 PMAQI
13th Jul 2025221 PMAQI
13th Jul 2025212 PMAQI
13th Jul 2025213 PMAQI
13th Jul 2025214 PMAQI
13th Jul 2025215 PMAQI
13th Jul 2025206 PMAQI
13th Jul 2025207 PMAQI
13th Jul 2025218 PMAQI
13th Jul 2025199 PMAQI
13th Jul 20251910 PMAQI
13th Jul 20251911 PMAQI
14th Jul 20252012 AMAQI
14th Jul 2025181 AMAQI
14th Jul 2025162 AMAQI
14th Jul 2025163 AMAQI
14th Jul 2025164 AMAQI
24°C16/34°C
14th Jul 2025165 AMAQI
14th Jul 2025166 AMAQI
14th Jul 2025167 AMAQI
14th Jul 2025178 AMAQI
14th Jul 2025179 AMAQI
14th Jul 20251610 AMAQI
14th Jul 20251711 AMAQI
14th Jul 20251712 PMAQI
14th Jul 2025171 PMAQI
14th Jul 2025182 PMAQI
14th Jul 2025163 PMAQI
14th Jul 2025174 PMAQI
14th Jul 2025175 PMAQI
14th Jul 2025186 PMAQI
14th Jul 2025177 PMAQI
14th Jul 2025188 PMAQI
14th Jul 2025199 PMAQI
14th Jul 20252010 PMAQI
14th Jul 20252011 PMAQI
15th Jul 20252012 AMAQI
15th Jul 2025221 AMAQI
15th Jul 2025192 AMAQI
15th Jul 2025193 AMAQI
15th Jul 2025184 AMAQI
16°C14/21°C
15th Jul 2025195 AMAQI
15th Jul 2025216 AMAQI
15th Jul 2025217 AMAQI
15th Jul 2025218 AMAQI
15th Jul 2025219 AMAQI
15th Jul 20252310 AMAQI
15th Jul 20252611 AMAQI
15th Jul 20252912 PMAQI
15th Jul 2025311 PMAQI
15th Jul 2025312 PMAQI
15th Jul 2025273 PMAQI
15th Jul 2025274 PMAQI
15th Jul 2025275 PMAQI
15th Jul 2025266 PMAQI
15th Jul 2025247 PMAQI
15th Jul 2025248 PMAQI
15th Jul 2025269 PMAQI
15th Jul 20252610 PMAQI
15th Jul 20252511 PMAQI
16th Jul 20252512 AMAQI
16th Jul 2025241 AMAQI
16th Jul 2025242 AMAQI
16th Jul 2025253 AMAQI
16th Jul 2025254 AMAQI
22°C12/32°C
16th Jul 2025235 AMAQI
16th Jul 2025246 AMAQI
16th Jul 2025237 AMAQI
16th Jul 2025258 AMAQI
16th Jul 2025279 AMAQI
16th Jul 20253010 AMAQI
16th Jul 20253111 AMAQI
16th Jul 20253312 PMAQI
16th Jul 2025341 PMAQI
16th Jul 2025342 PMAQI
16th Jul 2025333 PMAQI
16th Jul 2025334 PMAQI
16th Jul 2025335 PMAQI
16th Jul 2025326 PMAQI
16th Jul 2025287 PMAQI
16th Jul 2025288 PMAQI
16th Jul 2025289 PMAQI
16th Jul 20252810 PMAQI
16th Jul 20252811 PMAQI
17th Jul 20252712 AMAQI
17th Jul 2025251 AMAQI
17th Jul 2025272 AMAQI
17th Jul 2025283 AMAQI
17th Jul 2025314 AMAQI
26°C18/35°C
17th Jul 2025325 AMAQI
17th Jul 2025356 AMAQI
17th Jul 2025367 AMAQI
17th Jul 2025368 AMAQI
17th Jul 2025369 AMAQI
17th Jul 20253310 AMAQI
17th Jul 20253411 AMAQI
17th Jul 20253412 PMAQI
17th Jul 2025341 PMAQI
17th Jul 2025372 PMAQI
17th Jul 2025363 PMAQI
17th Jul 2025354 PMAQI
17th Jul 2025365 PMAQI
17th Jul 2025366 PMAQI
17th Jul 2025357 PMAQI
17th Jul 2025348 PMAQI
17th Jul 2025319 PMAQI
17th Jul 20253010 PMAQI
17th Jul 20252811 PMAQI
18th Jul 20252712 AMAQI
18th Jul 2025271 AMAQI
18th Jul 2025262 AMAQI
18th Jul 2025263 AMAQI
18th Jul 2025254 AMAQI
20°C13/29°C
18th Jul 2025285 AMAQI
18th Jul 2025286 AMAQI
18th Jul 2025277 AMAQI
18th Jul 2025288 AMAQI
18th Jul 2025289 AMAQI
18th Jul 20252710 AMAQI
18th Jul 20252711 AMAQI
18th Jul 20253012 PMAQI
18th Jul 2025311 PMAQI
18th Jul 2025302 PMAQI
18th Jul 2025283 PMAQI
18th Jul 2025294 PMAQI
18th Jul 2025285 PMAQI
18th Jul 2025286 PMAQI
18th Jul 2025277 PMAQI
18th Jul 2025278 PMAQI
18th Jul 2025249 PMAQI
18th Jul 20252410 PMAQI
18th Jul 20252511 PMAQI
19th Jul 20252412 AMAQI
19th Jul 2025241 AMAQI
19th Jul 2025232 AMAQI
19th Jul 2025223 AMAQI
19th Jul 2025204 AMAQI
18°C14/23°C
19th Jul 2025215 AMAQI
19th Jul 2025216 AMAQI
19th Jul 2025217 AMAQI
19th Jul 2025228 AMAQI
19th Jul 2025219 AMAQI
19th Jul 20252110 AMAQI
19th Jul 20252211 AMAQI
19th Jul 20252212 PMAQI
19th Jul 2025241 PMAQI
19th Jul 2025242 PMAQI
19th Jul 2025243 PMAQI
19th Jul 2025244 PMAQI
19th Jul 2025245 PMAQI
19th Jul 2025246 PMAQI
19th Jul 2025237 PMAQI
19th Jul 2025238 PMAQI
19th Jul 2025259 PMAQI
19th Jul 20252410 PMAQI
19th Jul 20252511 PMAQI
20th Jul 20252512 AMAQI
20th Jul 2025241 AMAQI
20th Jul 2025212 AMAQI
20th Jul 2025223 AMAQI
20th Jul 2025214 AMAQI
16°C12/23°C
20th Jul 2025215 AMAQI
20th Jul 2025226 AMAQI
20th Jul 2025217 AMAQI
20th Jul 2025208 AMAQI
20th Jul 2025199 AMAQI
20th Jul 20251810 AMAQI
20th Jul 20252011 AMAQI
20th Jul 20252012 PMAQI
20th Jul 2025201 PMAQI
20th Jul 2025212 PMAQI
20th Jul 2025223 PMAQI
20th Jul 2025224 PMAQI
20th Jul 2025225 PMAQI
20th Jul 2025216 PMAQI
20th Jul 2025227 PMAQI
20th Jul 2025218 PMAQI
20th Jul 2025229 PMAQI
20th Jul 20252110 PMAQI
20th Jul 20252111 PMAQI
21st Jul 20252212 AMAQI
21st Jul 2025221 AMAQI
21st Jul 2025222 AMAQI
21st Jul 2025223 AMAQI
21st Jul 2025244 AMAQI
15°C12/20°C
21st Jul 2025215 AMAQI
21st Jul 2025256 AMAQI
21st Jul 2025267 AMAQI
21st Jul 2025288 AMAQI
21st Jul 2025269 AMAQI
21st Jul 20252510 AMAQI
21st Jul 20252311 AMAQI
21st Jul 20252212 PMAQI
21st Jul 2025221 PMAQI
21st Jul 2025222 PMAQI
21st Jul 2025233 PMAQI
21st Jul 2025234 PMAQI
21st Jul 2025235 PMAQI
21st Jul 2025246 PMAQI
21st Jul 2025237 PMAQI
21st Jul 2025238 PMAQI
21st Jul 2025239 PMAQI
21st Jul 20252310 PMAQI
21st Jul 20252211 PMAQI
22nd Jul 20252312 AMAQI
22nd Jul 2025221 AMAQI
22nd Jul 2025212 AMAQI
22nd Jul 2025203 AMAQI
22nd Jul 2025194 AMAQI
18°C14/24°C
22nd Jul 2025195 AMAQI
22nd Jul 2025206 AMAQI
22nd Jul 2025217 AMAQI
22nd Jul 2025228 AMAQI
22nd Jul 2025229 AMAQI
22nd Jul 20252310 AMAQI
22nd Jul 20252311 AMAQI
22nd Jul 20252312 PMAQI
22nd Jul 2025221 PMAQI
22nd Jul 2025232 PMAQI
22nd Jul 2025223 PMAQI
22nd Jul 2025234 PMAQI
22nd Jul 2025225 PMAQI
22nd Jul 2025216 PMAQI
22nd Jul 2025217 PMAQI
22nd Jul 2025218 PMAQI
22nd Jul 2025219 PMAQI
22nd Jul 20252210 PMAQI
22nd Jul 20252111 PMAQI
23rd Jul 20252112 AMAQI
23rd Jul 2025211 AMAQI
23rd Jul 2025202 AMAQI
23rd Jul 2025203 AMAQI
23rd Jul 2025194 AMAQI
18°C12/25°C
23rd Jul 2025215 AMAQI
23rd Jul 2025186 AMAQI
23rd Jul 2025197 AMAQI
23rd Jul 2025208 AMAQI
23rd Jul 2025219 AMAQI
23rd Jul 20252310 AMAQI
23rd Jul 20252511 AMAQI
23rd Jul 20252712 PMAQI
23rd Jul 2025271 PMAQI
23rd Jul 2025262 PMAQI
23rd Jul 2025263 PMAQI
23rd Jul 2025264 PMAQI
23rd Jul 2025265 PMAQI
23rd Jul 2025256 PMAQI
23rd Jul 2025237 PMAQI
23rd Jul 2025238 PMAQI
23rd Jul 2025239 PMAQI
23rd Jul 20252410 PMAQI
23rd Jul 20252211 PMAQI
24th Jul 20252112 AMAQI
24th Jul 2025211 AMAQI
24th Jul 2025202 AMAQI
24th Jul 2025203 AMAQI
24th Jul 2025194 AMAQI
20°C13/31°C
24th Jul 2025205 AMAQI
24th Jul 2025236 AMAQI
24th Jul 2025217 AMAQI
24th Jul 2025228 AMAQI
24th Jul 2025229 AMAQI
24th Jul 20252310 AMAQI
24th Jul 20252311 AMAQI
24th Jul 20252412 PMAQI
24th Jul 2025271 PMAQI
24th Jul 2025282 PMAQI
24th Jul 2025273 PMAQI
24th Jul 2025284 PMAQI
24th Jul 2025295 PMAQI
24th Jul 2025306 PMAQI
24th Jul 2025267 PMAQI
24th Jul 2025268 PMAQI
24th Jul 2025299 PMAQI
24th Jul 20252710 PMAQI
24th Jul 20252511 PMAQI
25th Jul 20252412 AMAQI
25th Jul 2025231 AMAQI
25th Jul 2025252 AMAQI
25th Jul 2025263 AMAQI
25th Jul 2025284 AMAQI
18°C14/26°C
25th Jul 2025295 AMAQI
25th Jul 2025286 AMAQI
25th Jul 2025287 AMAQI
25th Jul 2025278 AMAQI
25th Jul 2025279 AMAQI
25th Jul 20252610 AMAQI
25th Jul 20252711 AMAQI
25th Jul 20252712 PMAQI
25th Jul 2025271 PMAQI
25th Jul 2025292 PMAQI
25th Jul 2025283 PMAQI
25th Jul 2025274 PMAQI
25th Jul 2025265 PMAQI
25th Jul 2025256 PMAQI
25th Jul 2025267 PMAQI
25th Jul 2025268 PMAQI
25th Jul 2025249 PMAQI
25th Jul 20252610 PMAQI
25th Jul 20252811 PMAQI
26th Jul 20253012 AMAQI
26th Jul 2025461 AMAQI
26th Jul 2025522 AMAQI
26th Jul 2025523 AMAQI
26th Jul 2025534 AMAQI
16°C14/21°C
26th Jul 2025525 AMAQI
26th Jul 2025526 AMAQI
26th Jul 2025537 AMAQI
26th Jul 2025508 AMAQI
26th Jul 2025469 AMAQI
26th Jul 20254310 AMAQI
26th Jul 20254011 AMAQI
26th Jul 20253712 PMAQI
26th Jul 2025351 PMAQI
26th Jul 2025352 PMAQI
26th Jul 2025353 PMAQI
26th Jul 2025374 PMAQI
26th Jul 2025375 PMAQI
26th Jul 2025366 PMAQI
26th Jul 2025397 PMAQI
26th Jul 2025368 PMAQI
26th Jul 2025369 PMAQI
26th Jul 20253610 PMAQI
26th Jul 20253711 PMAQI
27th Jul 20253612 AMAQI
27th Jul 2025311 AMAQI
27th Jul 2025332 AMAQI
27th Jul 2025333 AMAQI
27th Jul 2025354 AMAQI
15°C11/20°C
27th Jul 2025375 AMAQI
27th Jul 2025386 AMAQI
27th Jul 2025387 AMAQI
27th Jul 2025398 AMAQI
27th Jul 2025409 AMAQI
27th Jul 20254110 AMAQI
27th Jul 20254111 AMAQI
27th Jul 20254112 PMAQI
27th Jul 2025421 PMAQI
27th Jul 2025402 PMAQI
27th Jul 2025413 PMAQI
27th Jul 2025394 PMAQI
27th Jul 2025395 PMAQI
27th Jul 2025376 PMAQI
27th Jul 2025387 PMAQI
27th Jul 2025378 PMAQI
27th Jul 2025359 PMAQI
27th Jul 20253410 PMAQI
27th Jul 20253511 PMAQI
28th Jul 20253512 AMAQI
28th Jul 2025351 AMAQI
28th Jul 2025322 AMAQI
28th Jul 2025323 AMAQI
28th Jul 2025304 AMAQI
17°C12/23°C
28th Jul 2025315 AMAQI
28th Jul 2025296 AMAQI
28th Jul 2025307 AMAQI
28th Jul 2025308 AMAQI
28th Jul 2025319 AMAQI
28th Jul 20253110 AMAQI
28th Jul 20253211 AMAQI
28th Jul 20253312 PMAQI
28th Jul 2025331 PMAQI
28th Jul 2025342 PMAQI
28th Jul 2025333 PMAQI
28th Jul 2025334 PMAQI
28th Jul 2025335 PMAQI
28th Jul 2025326 PMAQI
28th Jul 2025337 PMAQI
28th Jul 2025338 PMAQI
28th Jul 2025329 PMAQI
28th Jul 20253210 PMAQI
28th Jul 20253111 PMAQI
29th Jul 20253012 AMAQI
29th Jul 2025301 AMAQI
29th Jul 2025292 AMAQI
29th Jul 2025273 AMAQI
29th Jul 2025284 AMAQI
19°C11/29°C
29th Jul 2025285 AMAQI
29th Jul 2025286 AMAQI
29th Jul 2025297 AMAQI
29th Jul 2025298 AMAQI
29th Jul 2025299 AMAQI
29th Jul 20253010 AMAQI
29th Jul 20253111 AMAQI
29th Jul 20253212 PMAQI
29th Jul 2025301 PMAQI
29th Jul 2025322 PMAQI
29th Jul 2025313 PMAQI
29th Jul 2025314 PMAQI
29th Jul 2025315 PMAQI
29th Jul 2025316 PMAQI
29th Jul 2025307 PMAQI
29th Jul 2025318 PMAQI
29th Jul 2025309 PMAQI
29th Jul 20252910 PMAQI
29th Jul 20253011 PMAQI
30th Jul 20253112 AMAQI
30th Jul 2025291 AMAQI
30th Jul 2025282 AMAQI
30th Jul 2025283 AMAQI
30th Jul 2025274 AMAQI
22°C13/32°C
30th Jul 2025275 AMAQI
30th Jul 2025276 AMAQI
30th Jul 2025287 AMAQI
30th Jul 2025288 AMAQI
30th Jul 2025289 AMAQI
30th Jul 20252810 AMAQI
30th Jul 20252811 AMAQI
30th Jul 20252912 PMAQI
30th Jul 2025291 PMAQI
30th Jul 2025312 PMAQI
30th Jul 2025313 PMAQI
30th Jul 2025314 PMAQI
30th Jul 2025315 PMAQI
30th Jul 2025316 PMAQI
30th Jul 2025317 PMAQI
30th Jul 2025318 PMAQI
30th Jul 2025349 PMAQI
30th Jul 20253410 PMAQI
30th Jul 20253311 PMAQI
31st Jul 20253212 AMAQI
31st Jul 2025311 AMAQI
31st Jul 2025312 AMAQI
31st Jul 2025293 AMAQI
31st Jul 2025284 AMAQI
20°C13/30°C
31st Jul 2025275 AMAQI
31st Jul 2025286 AMAQI
31st Jul 2025327 AMAQI
31st Jul 2025328 AMAQI
31st Jul 2025339 AMAQI
31st Jul 20253610 AMAQI
31st Jul 20254011 AMAQI
31st Jul 20254412 PMAQI
31st Jul 2025441 PMAQI
31st Jul 2025422 PMAQI
31st Jul 2025383 PMAQI
31st Jul 2025374 PMAQI
31st Jul 2025375 PMAQI
31st Jul 2025376 PMAQI
31st Jul 2025367 PMAQI
31st Jul 2025388 PMAQI
31st Jul 2025389 PMAQI
31st Jul 20253810 PMAQI
31st Jul 20253811 PMAQI
1st Aug 20253512 AMAQI
1st Aug 2025341 AMAQI
1st Aug 2025332 AMAQI
1st Aug 2025333 AMAQI
1st Aug 2025344 AMAQI
18°C15/24°C
1st Aug 2025325 AMAQI
1st Aug 2025316 AMAQI
1st Aug 2025297 AMAQI
1st Aug 2025278 AMAQI
1st Aug 2025259 AMAQI
1st Aug 20252410 AMAQI
1st Aug 20252211 AMAQI
1st Aug 20252112 PMAQI
1st Aug 2025221 PMAQI
1st Aug 2025212 PMAQI
1st Aug 2025213 PMAQI
1st Aug 2025194 PMAQI
1st Aug 2025195 PMAQI
1st Aug 2025186 PMAQI
1st Aug 2025297 PMAQI
1st Aug 2025248 PMAQI
1st Aug 2025199 PMAQI
1st Aug 20252110 PMAQI
1st Aug 20252311 PMAQI
2nd Aug 20252512 AMAQI
2nd Aug 2025221 AMAQI
2nd Aug 2025202 AMAQI
2nd Aug 2025203 AMAQI
2nd Aug 2025194 AMAQI
18°C14/23°C
2nd Aug 2025185 AMAQI
5 AM2nd Aug 2025176 AMAQI
2nd Aug 2025177 AMAQI
2nd Aug 2025178 AMAQI
2nd Aug 2025169 AMAQI
2nd Aug 20251710 AMAQI
2nd Aug 20251611 AMAQI
2nd Aug 20251612 PMAQI
12 PM8 PM
12 AM
4 AM
--°C/°C
Day time
Avg. Highest Time
5 AM - 8 PM
26AQI
16 hours / Day
480 hours / Month
Avg. Lowest Time
5 AM - 8 PM
26AQI
16 hours / Day
480 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 PM (Avg. 26), while the lowest AQI was between 5 AM to 8 PM (Avg. 26).
Night time
Avg. Highest Time
12 AM - 11 PM
25AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
25AQI
8 hours / Day
240 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 25), while the lowest AQI was between 12 AM to 11 PM (Avg. 25).
2025 Days Vs Air Quality
Portland, Oregon, United States
2025
94%
201
6%
12
Total number of days with different AQI categories in last 214 days in 2025 (151 days remaining)
Good
201 DaysModerate
12 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 214 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
Portland, Oregon, 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
30AQI
30AQI
2nd January 2025
23AQI
23AQI
3rd January 2025
25AQI
25AQI
4th January 2025
24AQI
24AQI
5th January 2025
22AQI
22AQI
6th January 2025
22AQI
22AQI
7th January 2025
25AQI
25AQI
8th January 2025
31AQI
31AQI
9th January 2025
32AQI
32AQI
10th January 2025
35AQI
35AQI
11th January 2025
21AQI
21AQI
12th January 2025
29AQI
29AQI
13th January 2025
40AQI
40AQI
14th January 2025
49AQI
49AQI
15th January 2025
50AQI
50AQI
16th January 2025
49AQI
49AQI
17th January 2025
47AQI
47AQI
18th January 2025
32AQI
32AQI
19th January 2025
48AQI
48AQI
20th January 2025
38AQI
38AQI
21st January 2025
55AQI
55AQI
22nd January 2025
55AQI
55AQI
23rd January 2025
53AQI
53AQI
24th January 2025
44AQI
44AQI
25th January 2025
37AQI
37AQI
26th January 2025
33AQI
33AQI
27th January 2025
36AQI
36AQI
28th January 2025
47AQI
47AQI
29th January 2025
55AQI
55AQI
30th January 2025
73AQI
73AQI
31st January 2025
38AQI
38AQI
1st February 2025
21AQI
21AQI
2nd February 2025
25AQI
25AQI
3rd February 2025
25AQI
25AQI
4th February 2025
36AQI
36AQI
5th February 2025
33AQI
33AQI
6th February 2025
28AQI
28AQI
7th February 2025
30AQI
30AQI
8th February 2025
27AQI
27AQI
9th February 2025
46AQI
46AQI
10th February 2025
32AQI
32AQI
11th February 2025
25AQI
25AQI
12th February 2025
24AQI
24AQI
13th February 2025
23AQI
23AQI
14th February 2025
28AQI
28AQI
15th February 2025
36AQI
36AQI
16th February 2025
23AQI
23AQI
17th February 2025
20AQI
20AQI
18th February 2025
21AQI
21AQI
19th February 2025
20AQI
20AQI
20th February 2025
21AQI
21AQI
21st February 2025
22AQI
22AQI
22nd February 2025
23AQI
23AQI
23rd February 2025
18AQI
18AQI
24th February 2025
22AQI
22AQI
25th February 2025
21AQI
21AQI
26th February 2025
26AQI
26AQI
27th February 2025
23AQI
23AQI
28th February 2025
35AQI
35AQI
1st March 2025
36AQI
36AQI
2nd March 2025
23AQI
23AQI
3rd March 2025
24AQI
24AQI
4th March 2025
34AQI
34AQI
5th March 2025
51AQI
51AQI
6th March 2025
70AQI
70AQI
7th March 2025
66AQI
66AQI
8th March 2025
72AQI
72AQI
9th March 2025
71AQI
71AQI
10th March 2025
60AQI
60AQI
11th March 2025
57AQI
57AQI
12th March 2025
44AQI
44AQI
13th March 2025
36AQI
36AQI
14th March 2025
34AQI
34AQI
15th March 2025
29AQI
29AQI
16th March 2025
27AQI
27AQI
17th March 2025
25AQI
25AQI
18th March 2025
22AQI
22AQI
19th March 2025
21AQI
21AQI
20th March 2025
18AQI
18AQI
21st March 2025
18AQI
18AQI
22nd March 2025
21AQI
21AQI
23rd March 2025
21AQI
21AQI
24th March 2025
20AQI
20AQI
25th March 2025
24AQI
24AQI
26th March 2025
20AQI
20AQI
27th March 2025
17AQI
17AQI
28th March 2025
17AQI
17AQI
29th March 2025
17AQI
17AQI
30th March 2025
22AQI
22AQI
31st March 2025
17AQI
17AQI
1st April 2025
22AQI
22AQI
2nd April 2025
18AQI
18AQI
3rd April 2025
22AQI
22AQI
4th April 2025
26AQI
26AQI
5th April 2025
20AQI
20AQI
6th April 2025
30AQI
30AQI
7th April 2025
16AQI
16AQI
8th April 2025
15AQI
15AQI
9th April 2025
17AQI
17AQI
10th April 2025
20AQI
20AQI
11th April 2025
18AQI
18AQI
12th April 2025
17AQI
17AQI
13th April 2025
20AQI
20AQI
14th April 2025
20AQI
20AQI
15th April 2025
22AQI
22AQI
16th April 2025
23AQI
23AQI
17th April 2025
21AQI
21AQI
18th April 2025
23AQI
23AQI
19th April 2025
22AQI
22AQI
20th April 2025
18AQI
18AQI
21st April 2025
16AQI
16AQI
22nd April 2025
17AQI
17AQI
23rd April 2025
21AQI
21AQI
24th April 2025
28AQI
28AQI
25th April 2025
35AQI
35AQI
26th April 2025
27AQI
27AQI
27th April 2025
22AQI
22AQI
28th April 2025
15AQI
15AQI
29th April 2025
17AQI
17AQI
30th April 2025
19AQI
19AQI
1st May 2025
28AQI
28AQI
2nd May 2025
25AQI
25AQI
3rd May 2025
14AQI
14AQI
4th May 2025
16AQI
16AQI
5th May 2025
18AQI
18AQI
6th May 2025
22AQI
22AQI
7th May 2025
22AQI
22AQI
8th May 2025
19AQI
19AQI
9th May 2025
24AQI
24AQI
10th May 2025
24AQI
24AQI
11th May 2025
15AQI
15AQI
12th May 2025
19AQI
19AQI
13th May 2025
18AQI
18AQI
14th May 2025
21AQI
21AQI
15th May 2025
19AQI
19AQI
16th May 2025
21AQI
21AQI
17th May 2025
18AQI
18AQI
18th May 2025
15AQI
15AQI
19th May 2025
17AQI
17AQI
20th May 2025
12AQI
12AQI
21st May 2025
15AQI
15AQI
22nd May 2025
21AQI
21AQI
23rd May 2025
17AQI
17AQI
24th May 2025
18AQI
18AQI
25th May 2025
18AQI
18AQI
26th May 2025
15AQI
15AQI
27th May 2025
18AQI
18AQI
28th May 2025
22AQI
22AQI
29th May 2025
16AQI
16AQI
30th May 2025
19AQI
19AQI
31st May 2025
19AQI
19AQI
1st June 2025
17AQI
17AQI
2nd June 2025
21AQI
21AQI
3rd June 2025
23AQI
23AQI
4th June 2025
16AQI
16AQI
5th June 2025
17AQI
17AQI
6th June 2025
20AQI
20AQI
7th June 2025
20AQI
20AQI
8th June 2025
32AQI
32AQI
9th June 2025
32AQI
32AQI
10th June 2025
32AQI
32AQI
11th June 2025
34AQI
34AQI
12th June 2025
30AQI
30AQI
13th June 2025
21AQI
21AQI
14th June 2025
20AQI
20AQI
15th June 2025
22AQI
22AQI
16th June 2025
24AQI
24AQI
17th June 2025
20AQI
20AQI
18th June 2025
15AQI
15AQI
19th June 2025
16AQI
16AQI
20th June 2025
17AQI
17AQI
21st June 2025
17AQI
17AQI
22nd June 2025
16AQI
16AQI
23rd June 2025
23AQI
23AQI
24th June 2025
30AQI
30AQI
25th June 2025
30AQI
30AQI
26th June 2025
20AQI
20AQI
27th June 2025
16AQI
16AQI
28th June 2025
15AQI
15AQI
29th June 2025
19AQI
19AQI
30th June 2025
22AQI
22AQI
1st July 2025
20AQI
20AQI
2nd July 2025
15AQI
15AQI
3rd July 2025
15AQI
15AQI
4th July 2025
17AQI
17AQI
5th July 2025
21AQI
21AQI
6th July 2025
18AQI
18AQI
7th July 2025
19AQI
19AQI
8th July 2025
22AQI
22AQI
9th July 2025
16AQI
16AQI
10th July 2025
15AQI
15AQI
11th July 2025
19AQI
19AQI
12th July 2025
19AQI
19AQI
13th July 2025
21AQI
21AQI
14th July 2025
16AQI
16AQI
15th July 2025
21AQI
21AQI
16th July 2025
23AQI
23AQI
17th July 2025
31AQI
31AQI
18th July 2025
31AQI
31AQI
19th July 2025
22AQI
22AQI
20th July 2025
21AQI
21AQI
21st July 2025
22AQI
22AQI
22nd July 2025
24AQI
24AQI
23rd July 2025
22AQI
22AQI
24th July 2025
21AQI
21AQI
25th July 2025
18AQI
18AQI
26th July 2025
17AQI
17AQI
27th July 2025
22AQI
22AQI
28th July 2025
22AQI
22AQI
29th July 2025
20AQI
20AQI
30th July 2025
23AQI
23AQI
31st July 2025
22AQI
22AQI
1st August 2025
18AQI
18AQI
39AQI
26AQI
33AQI
21AQI
19AQI
22AQI
20AQI
18AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202526AQI
26
5
28
24
7
30
31
30
31
1
201
12
Highest AQI recorded in
January39AQI
Lowest AQI recorded in
August18AQI
202423AQI
31
29
31
30
31
29
31
31
27
3
30
1
27
3
31
358
7
Highest AQI recorded in
November32AQI
Lowest AQI recorded in
May16AQI
202324AQI
28
3
23
5
31
30
31
30
31
27
4
30
31
29
31
352
12
Highest AQI recorded in
February32AQI
Lowest AQI recorded in
June19AQI
202229AQI
29
1
17
5
29
2
17
31
30
21
3
26
2
1
18
10
2
1
27
3
27
4
275
27
3
1
Highest AQI recorded in
October55AQI
Lowest AQI recorded in
May15AQI
202131AQI
12
13
5
1
17
6
5
25
6
30
31
30
31
30
1
29
1
30
1
26
4
31
322
32
10
1
Highest AQI recorded in
January67AQI
Lowest AQI recorded in
May18AQI
202037AQI
12
1
20
18
30
31
31
18
4
1
2
5
25
6
23
7
31
239
18
1
2
5
Highest AQI recorded in
September112AQI
Lowest AQI recorded in
June17AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2020(Avg.)
37AQILeast Polluted Year Recorded
2024(Avg.)
23AQIPortland's annual 2025 AQI (26) shows an average percentage change of -7.5% (improved AQI) compared to previous years: 2020 (37), 2021 (31), 2022 (29), 2023 (24), 2024 (23).
