18AQI
Hi, Know the Air Quality around you
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
My Current Location
Portland, Oregon, United StatesReal-Time Air Quality Index (AQI) Analysis
United States27AQI
Good
Good
Oregon19AQI
Good
Good
My Location18AQI
Good
Good
Current AQI level at My Location is in the Good Category and it is 1.06x lower than in Oregon Current AQI level and 1.5x lower than in United States.
My Location
Portland, Oregon, United States
AQI Station
18AQI
Good
Last Updated: 2025-05-28 02:56:04 AMGood
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Take control of the air you breatheOwn An AQI Monitor
Health Advice
Portland, Oregon, United States
0Cigarettes per day
Breathe easy and get active! The air quality is perfect for enjoying outdoor activities.28 May 2025
Source:
Berkeley Earth
Asthma
Low Chances of Asthma
Risk of Asthma symptoms is Low when AQI is Good (0-50)
- Asthma
- Heart Issues
- Allergies
- Sinus
- Cold/Flu
- Chronic (COPD)
You may not experience any symptoms.
Do's :
Stay hydrated and keep your airways moist.
Check the air quality of your area every time.
Don'ts :
Skip medications prescribed by your doctor.
Visit outdoors in the early morning during high pollen.
Note: This is general advice. Please consult your doctor for personalized care and not rely solely on the above recommendations.
May Air Quality Analysis
Portland, Oregon, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
22nd May 2021
36AQILowest AQI recorded on
2nd May 2022
10AQISame Day Analysis (26th May ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 16 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: 27th May - 28th May 2025
Portland, Oregon, United States
AQI
Day
Night
.
5 AM27th May 2025
8 PM
4 AM28th May 2025
Day time
Avg. Highest Time
4PM27th May
25AQI
Avg. Lowest Time
7AM27th May
15AQI
Night time
Avg. Highest Time
10PM27th May
22AQI
Avg. Lowest Time
12AM28th May
20AQI
In the last 24 hours,
Portland's AQI reached its highest point of 25 at 4 PM during the Day, while the lowest point, undefined, was recorded at 4 AM during the Night between 27th May and 28th May 2025.
Day & Night AQI Trend : Apr - May 2025
Portland, Oregon, United States
AprMay
28th - 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 - 26th26th - 27th27th - 28th28th
Day
Night
28th Apr 2025155 AMAQI
28th Apr 2025146 AMAQI
28th Apr 2025147 AMAQI
28th Apr 2025148 AMAQI
28th Apr 2025149 AMAQI
28th Apr 20251510 AMAQI
28th Apr 20251611 AMAQI
28th Apr 20251612 PMAQI
28th Apr 2025171 PMAQI
28th Apr 2025172 PMAQI
28th Apr 2025163 PMAQI
28th Apr 2025174 PMAQI
28th Apr 2025175 PMAQI
28th Apr 2025166 PMAQI
28th Apr 2025167 PMAQI
28th Apr 2025178 PMAQI
28th Apr 2025209 PMAQI
28th Apr 20252110 PMAQI
28th Apr 20251811 PMAQI
29th Apr 20251912 AMAQI
29th Apr 2025191 AMAQI
29th Apr 2025192 AMAQI
29th Apr 2025193 AMAQI
29th Apr 2025204 AMAQI
13°C9/17°C
29th Apr 2025215 AMAQI
29th Apr 2025236 AMAQI
29th Apr 2025227 AMAQI
29th Apr 2025208 AMAQI
29th Apr 2025209 AMAQI
29th Apr 20251910 AMAQI
29th Apr 20251911 AMAQI
29th Apr 20252012 PMAQI
29th Apr 2025221 PMAQI
29th Apr 2025202 PMAQI
29th Apr 2025193 PMAQI
29th Apr 2025214 PMAQI
29th Apr 2025275 PMAQI
29th Apr 2025256 PMAQI
29th Apr 2025247 PMAQI
29th Apr 2025238 PMAQI
29th Apr 2025279 PMAQI
29th Apr 20252410 PMAQI
29th Apr 20252511 PMAQI
30th Apr 20252412 AMAQI
30th Apr 2025231 AMAQI
30th Apr 2025222 AMAQI
30th Apr 2025213 AMAQI
30th Apr 2025224 AMAQI
13°C10/17°C
30th Apr 2025255 AMAQI
30th Apr 2025236 AMAQI
30th Apr 2025227 AMAQI
30th Apr 2025218 AMAQI
30th Apr 2025209 AMAQI
30th Apr 20251910 AMAQI
30th Apr 20252011 AMAQI
30th Apr 20252012 PMAQI
30th Apr 2025161 PMAQI
30th Apr 2025152 PMAQI
30th Apr 2025163 PMAQI
30th Apr 2025164 PMAQI
30th Apr 2025165 PMAQI
30th Apr 2025166 PMAQI
30th Apr 2025167 PMAQI
30th Apr 2025178 PMAQI
30th Apr 2025169 PMAQI
30th Apr 20251610 PMAQI
30th Apr 20251811 PMAQI
1st May 20252012 AMAQI
1st May 2025241 AMAQI
1st May 2025222 AMAQI
1st May 2025213 AMAQI
1st May 2025214 AMAQI
13°C8/20°C
1st May 2025225 AMAQI
1st May 2025256 AMAQI
1st May 2025277 AMAQI
1st May 2025278 AMAQI
1st May 2025279 AMAQI
1st May 20252810 AMAQI
1st May 20253311 AMAQI
1st May 20253112 PMAQI
1st May 2025281 PMAQI
1st May 2025282 PMAQI
1st May 2025273 PMAQI
1st May 2025284 PMAQI
1st May 2025275 PMAQI
1st May 2025276 PMAQI
1st May 2025237 PMAQI
1st May 2025238 PMAQI
1st May 2025239 PMAQI
1st May 20252210 PMAQI
1st May 20252111 PMAQI
2nd May 20252112 AMAQI
2nd May 2025211 AMAQI
2nd May 2025212 AMAQI
2nd May 2025313 AMAQI
2nd May 2025344 AMAQI
19°C8/30°C
2nd May 2025345 AMAQI
2nd May 2025326 AMAQI
2nd May 2025327 AMAQI
2nd May 2025318 AMAQI
2nd May 2025289 AMAQI
2nd May 20252610 AMAQI
2nd May 20252611 AMAQI
2nd May 20252412 PMAQI
2nd May 2025251 PMAQI
2nd May 2025282 PMAQI
2nd May 2025253 PMAQI
2nd May 2025294 PMAQI
2nd May 2025315 PMAQI
2nd May 2025286 PMAQI
2nd May 2025277 PMAQI
2nd May 2025258 PMAQI
2nd May 2025229 PMAQI
2nd May 20252010 PMAQI
2nd May 20251911 PMAQI
3rd May 20251812 AMAQI
3rd May 2025191 AMAQI
3rd May 2025192 AMAQI
3rd May 2025183 AMAQI
3rd May 2025174 AMAQI
17°C10/24°C
3rd May 2025205 AMAQI
3rd May 2025186 AMAQI
3rd May 2025157 AMAQI
3rd May 2025158 AMAQI
3rd May 2025169 AMAQI
3rd May 20251510 AMAQI
3rd May 20251711 AMAQI
3rd May 20251712 PMAQI
3rd May 2025231 PMAQI
3rd May 2025272 PMAQI
3rd May 2025223 PMAQI
3rd May 2025234 PMAQI
3rd May 2025265 PMAQI
3rd May 2025256 PMAQI
3rd May 2025237 PMAQI
3rd May 2025228 PMAQI
3rd May 2025229 PMAQI
3rd May 20252210 PMAQI
3rd May 20251911 PMAQI
4th May 20251812 AMAQI
4th May 2025161 AMAQI
4th May 2025152 AMAQI
4th May 2025173 AMAQI
4th May 2025174 AMAQI
12°C10/16°C
4th May 2025185 AMAQI
4th May 2025216 AMAQI
4th May 2025237 AMAQI
4th May 2025228 AMAQI
4th May 2025219 AMAQI
4th May 20252010 AMAQI
4th May 20251811 AMAQI
4th May 20252012 PMAQI
4th May 2025171 PMAQI
4th May 2025172 PMAQI
4th May 2025173 PMAQI
4th May 2025174 PMAQI
4th May 2025165 PMAQI
4th May 2025156 PMAQI
4th May 2025167 PMAQI
4th May 2025178 PMAQI
4th May 2025169 PMAQI
4th May 20251610 PMAQI
4th May 20251611 PMAQI
5th May 20251612 AMAQI
5th May 2025181 AMAQI
5th May 2025172 AMAQI
5th May 2025163 AMAQI
5th May 2025184 AMAQI
12°C7/20°C
5th May 2025185 AMAQI
5th May 2025176 AMAQI
5th May 2025197 AMAQI
5th May 2025218 AMAQI
5th May 2025209 AMAQI
5th May 20251810 AMAQI
5th May 20251911 AMAQI
5th May 20252212 PMAQI
5th May 2025221 PMAQI
5th May 2025222 PMAQI
5th May 2025213 PMAQI
5th May 2025194 PMAQI
5th May 2025185 PMAQI
5th May 2025196 PMAQI
5th May 2025177 PMAQI
5th May 2025208 PMAQI
5th May 2025189 PMAQI
5th May 20251710 PMAQI
5th May 20251711 PMAQI
6th May 20251812 AMAQI
6th May 2025191 AMAQI
6th May 2025182 AMAQI
6th May 2025193 AMAQI
6th May 2025204 AMAQI
16°C8/25°C
6th May 2025205 AMAQI
6th May 2025206 AMAQI
6th May 2025237 AMAQI
6th May 2025228 AMAQI
6th May 2025249 AMAQI
6th May 20252510 AMAQI
6th May 20252811 AMAQI
6th May 20252712 PMAQI
6th May 2025251 PMAQI
6th May 2025252 PMAQI
6th May 2025223 PMAQI
6th May 2025194 PMAQI
6th May 2025195 PMAQI
6th May 2025176 PMAQI
6th May 2025187 PMAQI
6th May 2025178 PMAQI
6th May 2025169 PMAQI
6th May 20251710 PMAQI
6th May 20251911 PMAQI
7th May 20252312 AMAQI
7th May 2025221 AMAQI
7th May 2025212 AMAQI
7th May 2025213 AMAQI
7th May 2025214 AMAQI
20°C13/30°C
7th May 2025215 AMAQI
7th May 2025226 AMAQI
7th May 2025257 AMAQI
7th May 2025248 AMAQI
7th May 2025249 AMAQI
7th May 20252510 AMAQI
7th May 20252711 AMAQI
7th May 20252412 PMAQI
7th May 2025271 PMAQI
7th May 2025282 PMAQI
7th May 2025253 PMAQI
7th May 2025264 PMAQI
7th May 2025245 PMAQI
7th May 2025266 PMAQI
7th May 2025237 PMAQI
7th May 2025218 PMAQI
7th May 2025219 PMAQI
7th May 20252010 PMAQI
7th May 20251911 PMAQI
8th May 20251912 AMAQI
8th May 2025191 AMAQI
8th May 2025232 AMAQI
8th May 2025223 AMAQI
8th May 2025224 AMAQI
15°C10/20°C
8th May 2025245 AMAQI
8th May 2025236 AMAQI
8th May 2025237 AMAQI
8th May 2025258 AMAQI
8th May 2025269 AMAQI
8th May 20252410 AMAQI
8th May 20252711 AMAQI
8th May 20252712 PMAQI
8th May 2025221 PMAQI
8th May 2025212 PMAQI
8th May 2025193 PMAQI
8th May 2025184 PMAQI
8th May 2025175 PMAQI
8th May 2025166 PMAQI
8th May 2025177 PMAQI
8th May 2025198 PMAQI
8th May 2025209 PMAQI
8th May 20251910 PMAQI
8th May 20251711 PMAQI
9th May 20251612 AMAQI
9th May 2025171 AMAQI
9th May 2025192 AMAQI
9th May 2025193 AMAQI
9th May 2025204 AMAQI
12°C6/20°C
9th May 2025215 AMAQI
9th May 2025246 AMAQI
9th May 2025297 AMAQI
9th May 2025288 AMAQI
9th May 2025269 AMAQI
9th May 20252710 AMAQI
9th May 20252611 AMAQI
9th May 20252612 PMAQI
9th May 2025271 PMAQI
9th May 2025272 PMAQI
9th May 2025263 PMAQI
9th May 2025264 PMAQI
9th May 2025255 PMAQI
9th May 2025236 PMAQI
9th May 2025217 PMAQI
9th May 2025218 PMAQI
9th May 2025229 PMAQI
9th May 20252210 PMAQI
9th May 20252311 PMAQI
10th May 20252212 AMAQI
10th May 2025211 AMAQI
10th May 2025192 AMAQI
10th May 2025203 AMAQI
10th May 2025264 AMAQI
18°C10/27°C
10th May 2025265 AMAQI
10th May 2025246 AMAQI
10th May 2025237 AMAQI
10th May 2025238 AMAQI
10th May 2025239 AMAQI
10th May 20252110 AMAQI
10th May 20252511 AMAQI
10th May 20252312 PMAQI
10th May 2025261 PMAQI
10th May 2025222 PMAQI
10th May 2025193 PMAQI
10th May 2025194 PMAQI
10th May 2025185 PMAQI
10th May 2025166 PMAQI
10th May 2025177 PMAQI
10th May 2025178 PMAQI
10th May 2025159 PMAQI
10th May 20251510 PMAQI
10th May 20251811 PMAQI
11th May 20251712 AMAQI
11th May 2025141 AMAQI
11th May 2025152 AMAQI
11th May 2025153 AMAQI
11th May 2025144 AMAQI
16°C11/21°C
11th May 2025145 AMAQI
11th May 2025156 AMAQI
11th May 2025157 AMAQI
11th May 2025168 AMAQI
11th May 2025179 AMAQI
11th May 20251510 AMAQI
11th May 20251511 AMAQI
11th May 20251512 PMAQI
11th May 2025151 PMAQI
11th May 2025182 PMAQI
11th May 2025143 PMAQI
11th May 2025144 PMAQI
11th May 2025155 PMAQI
11th May 2025166 PMAQI
11th May 2025157 PMAQI
11th May 2025158 PMAQI
11th May 2025159 PMAQI
11th May 20251410 PMAQI
11th May 20251511 PMAQI
12th May 20251512 AMAQI
12th May 2025171 AMAQI
12th May 2025182 AMAQI
12th May 2025183 AMAQI
12th May 2025204 AMAQI
13°C11/16°C
12th May 2025195 AMAQI
12th May 2025216 AMAQI
12th May 2025217 AMAQI
12th May 2025228 AMAQI
12th May 2025229 AMAQI
12th May 20252010 AMAQI
12th May 20251911 AMAQI
12th May 20251812 PMAQI
12th May 2025181 PMAQI
12th May 2025162 PMAQI
12th May 2025153 PMAQI
12th May 2025154 PMAQI
12th May 2025185 PMAQI
12th May 2025196 PMAQI
12th May 2025187 PMAQI
12th May 2025238 PMAQI
12th May 2025239 PMAQI
12th May 20252010 PMAQI
12th May 20252011 PMAQI
13th May 20252012 AMAQI
13th May 2025201 AMAQI
13th May 2025202 AMAQI
13th May 2025213 AMAQI
13th May 2025214 AMAQI
13°C10/17°C
13th May 2025215 AMAQI
13th May 2025206 AMAQI
13th May 2025227 AMAQI
13th May 2025218 AMAQI
13th May 2025229 AMAQI
13th May 20251910 AMAQI
13th May 20251911 AMAQI
13th May 20251912 PMAQI
13th May 2025181 PMAQI
13th May 2025212 PMAQI
13th May 2025213 PMAQI
13th May 2025174 PMAQI
13th May 2025175 PMAQI
13th May 2025186 PMAQI
13th May 2025207 PMAQI
13th May 2025238 PMAQI
13th May 2025189 PMAQI
13th May 20251910 PMAQI
13th May 20251711 PMAQI
14th May 20251612 AMAQI
14th May 2025201 AMAQI
14th May 2025242 AMAQI
14th May 2025253 AMAQI
14th May 2025284 AMAQI
13°C10/18°C
14th May 2025285 AMAQI
14th May 2025276 AMAQI
14th May 2025287 AMAQI
14th May 2025268 AMAQI
14th May 2025269 AMAQI
14th May 20252510 AMAQI
14th May 20252211 AMAQI
14th May 20252112 PMAQI
14th May 2025201 PMAQI
14th May 2025192 PMAQI
14th May 2025203 PMAQI
14th May 2025224 PMAQI
14th May 2025195 PMAQI
14th May 2025186 PMAQI
14th May 2025217 PMAQI
14th May 2025238 PMAQI
14th May 2025229 PMAQI
14th May 20252010 PMAQI
14th May 20252511 PMAQI
15th May 20252212 AMAQI
15th May 2025211 AMAQI
15th May 2025222 AMAQI
15th May 2025223 AMAQI
15th May 2025224 AMAQI
13°C10/17°C
15th May 2025185 AMAQI
15th May 2025196 AMAQI
15th May 2025197 AMAQI
15th May 2025228 AMAQI
15th May 2025269 AMAQI
15th May 20252410 AMAQI
15th May 20252811 AMAQI
15th May 20252712 PMAQI
15th May 2025271 PMAQI
15th May 2025282 PMAQI
15th May 2025273 PMAQI
15th May 2025284 PMAQI
15th May 2025285 PMAQI
15th May 2025276 PMAQI
15th May 2025247 PMAQI
15th May 2025258 PMAQI
15th May 2025259 PMAQI
15th May 20252610 PMAQI
15th May 20252411 PMAQI
16th May 20252512 AMAQI
16th May 2025261 AMAQI
16th May 2025252 AMAQI
16th May 2025263 AMAQI
16th May 2025244 AMAQI
11°C10/14°C
16th May 2025245 AMAQI
16th May 2025296 AMAQI
16th May 2025307 AMAQI
16th May 2025318 AMAQI
16th May 2025309 AMAQI
16th May 20253010 AMAQI
16th May 20252511 AMAQI
16th May 20252312 PMAQI
16th May 2025231 PMAQI
16th May 2025222 PMAQI
16th May 2025213 PMAQI
16th May 2025214 PMAQI
16th May 2025235 PMAQI
16th May 2025246 PMAQI
16th May 2025237 PMAQI
16th May 2025228 PMAQI
16th May 2025189 PMAQI
16th May 20251610 PMAQI
16th May 20252011 PMAQI
17th May 20252512 AMAQI
17th May 2025261 AMAQI
17th May 2025212 AMAQI
17th May 2025223 AMAQI
17th May 2025214 AMAQI
13°C10/18°C
17th May 2025215 AMAQI
17th May 2025206 AMAQI
17th May 2025237 AMAQI
17th May 2025228 AMAQI
17th May 2025219 AMAQI
17th May 20251810 AMAQI
17th May 20251611 AMAQI
17th May 20251712 PMAQI
17th May 2025161 PMAQI
17th May 2025152 PMAQI
17th May 2025143 PMAQI
17th May 2025144 PMAQI
17th May 2025145 PMAQI
17th May 2025166 PMAQI
17th May 2025177 PMAQI
17th May 2025178 PMAQI
17th May 2025189 PMAQI
17th May 20251710 PMAQI
17th May 20251411 PMAQI
18th May 20251312 AMAQI
18th May 2025131 AMAQI
18th May 2025142 AMAQI
18th May 2025123 AMAQI
18th May 2025134 AMAQI
14°C11/16°C
18th May 2025145 AMAQI
18th May 2025146 AMAQI
18th May 2025147 AMAQI
18th May 2025138 AMAQI
18th May 2025149 AMAQI
18th May 20251410 AMAQI
18th May 20251511 AMAQI
18th May 20251612 PMAQI
18th May 2025181 PMAQI
18th May 2025162 PMAQI
18th May 2025163 PMAQI
18th May 2025144 PMAQI
18th May 2025175 PMAQI
18th May 2025176 PMAQI
18th May 2025147 PMAQI
18th May 2025168 PMAQI
18th May 2025189 PMAQI
18th May 20251710 PMAQI
18th May 20251911 PMAQI
19th May 20251712 AMAQI
19th May 2025171 AMAQI
19th May 2025182 AMAQI
19th May 2025193 AMAQI
19th May 2025204 AMAQI
11°C8/15°C
19th May 2025195 AMAQI
19th May 2025216 AMAQI
19th May 2025217 AMAQI
19th May 2025218 AMAQI
19th May 2025179 AMAQI
19th May 20251610 AMAQI
19th May 20251511 AMAQI
19th May 20251412 PMAQI
19th May 2025141 PMAQI
19th May 2025142 PMAQI
19th May 2025163 PMAQI
19th May 2025164 PMAQI
19th May 2025135 PMAQI
19th May 2025156 PMAQI
19th May 2025157 PMAQI
19th May 2025158 PMAQI
19th May 2025139 PMAQI
19th May 20251210 PMAQI
19th May 20251011 PMAQI
20th May 20251112 AMAQI
20th May 2025111 AMAQI
20th May 2025112 AMAQI
20th May 2025123 AMAQI
20th May 2025124 AMAQI
12°C10/15°C
20th May 2025105 AMAQI
20th May 2025116 AMAQI
20th May 2025107 AMAQI
20th May 2025118 AMAQI
20th May 2025119 AMAQI
20th May 20251310 AMAQI
20th May 20251211 AMAQI
20th May 20251212 PMAQI
20th May 2025131 PMAQI
20th May 2025142 PMAQI
20th May 2025163 PMAQI
20th May 2025144 PMAQI
20th May 2025115 PMAQI
20th May 2025116 PMAQI
20th May 2025127 PMAQI
20th May 2025138 PMAQI
20th May 2025129 PMAQI
20th May 20251310 PMAQI
20th May 20251211 PMAQI
21st May 20251312 AMAQI
21st May 2025141 AMAQI
21st May 2025142 AMAQI
21st May 2025133 AMAQI
21st May 2025144 AMAQI
11°C9/15°C
21st May 2025125 AMAQI
21st May 2025136 AMAQI
21st May 2025147 AMAQI
21st May 2025168 AMAQI
21st May 2025149 AMAQI
21st May 20251310 AMAQI
21st May 20252011 AMAQI
21st May 20251812 PMAQI
21st May 2025161 PMAQI
21st May 2025192 PMAQI
21st May 2025163 PMAQI
21st May 2025154 PMAQI
21st May 2025175 PMAQI
21st May 2025166 PMAQI
21st May 2025147 PMAQI
21st May 2025158 PMAQI
21st May 2025169 PMAQI
21st May 20251610 PMAQI
21st May 20251811 PMAQI
22nd May 20251912 AMAQI
22nd May 2025181 AMAQI
22nd May 2025192 AMAQI
22nd May 2025183 AMAQI
22nd May 2025204 AMAQI
16°C10/21°C
22nd May 2025185 AMAQI
22nd May 2025206 AMAQI
22nd May 2025217 AMAQI
22nd May 2025228 AMAQI
22nd May 2025279 AMAQI
22nd May 20252210 AMAQI
22nd May 20252311 AMAQI
22nd May 20252112 PMAQI
22nd May 2025221 PMAQI
22nd May 2025222 PMAQI
22nd May 2025193 PMAQI
22nd May 2025224 PMAQI
22nd May 2025185 PMAQI
22nd May 2025216 PMAQI
22nd May 2025217 PMAQI
22nd May 2025218 PMAQI
22nd May 2025229 PMAQI
22nd May 20252010 PMAQI
22nd May 20251911 PMAQI
23rd May 20251712 AMAQI
23rd May 2025181 AMAQI
23rd May 2025172 AMAQI
23rd May 2025163 AMAQI
23rd May 2025154 AMAQI
15°C12/18°C
23rd May 2025165 AMAQI
23rd May 2025156 AMAQI
23rd May 2025157 AMAQI
23rd May 2025138 AMAQI
23rd May 2025149 AMAQI
23rd May 20251410 AMAQI
23rd May 20251711 AMAQI
23rd May 20251912 PMAQI
23rd May 2025181 PMAQI
23rd May 2025192 PMAQI
23rd May 2025203 PMAQI
23rd May 2025164 PMAQI
23rd May 2025155 PMAQI
23rd May 2025146 PMAQI
23rd May 2025157 PMAQI
23rd May 2025158 PMAQI
23rd May 2025139 PMAQI
23rd May 20251510 PMAQI
23rd May 20251511 PMAQI
24th May 20251512 AMAQI
24th May 2025151 AMAQI
24th May 2025142 AMAQI
24th May 2025143 AMAQI
24th May 2025164 AMAQI
16°C12/22°C
24th May 2025165 AMAQI
24th May 2025166 AMAQI
24th May 2025157 AMAQI
24th May 2025178 AMAQI
24th May 2025199 AMAQI
24th May 20251810 AMAQI
24th May 20251811 AMAQI
24th May 20251912 PMAQI
24th May 2025201 PMAQI
24th May 2025202 PMAQI
24th May 2025213 PMAQI
24th May 2025174 PMAQI
24th May 2025175 PMAQI
24th May 2025156 PMAQI
24th May 2025157 PMAQI
24th May 2025158 PMAQI
24th May 2025159 PMAQI
24th May 20251410 PMAQI
24th May 20251611 PMAQI
25th May 20251712 AMAQI
25th May 2025161 AMAQI
25th May 2025182 AMAQI
25th May 2025183 AMAQI
25th May 2025174 AMAQI
19°C10/28°C
25th May 2025195 AMAQI
25th May 2025196 AMAQI
25th May 2025217 AMAQI
25th May 2025198 AMAQI
25th May 2025169 AMAQI
25th May 20251610 AMAQI
25th May 20251411 AMAQI
25th May 20251412 PMAQI
25th May 2025141 PMAQI
25th May 2025152 PMAQI
25th May 2025163 PMAQI
25th May 2025164 PMAQI
25th May 2025155 PMAQI
25th May 2025166 PMAQI
25th May 2025157 PMAQI
25th May 2025168 PMAQI
25th May 2025169 PMAQI
25th May 20251710 PMAQI
25th May 20251911 PMAQI
26th May 20251912 AMAQI
26th May 2025191 AMAQI
26th May 2025202 AMAQI
26th May 2025163 AMAQI
26th May 2025164 AMAQI
16°C12/20°C
26th May 2025155 AMAQI
26th May 2025156 AMAQI
26th May 2025147 AMAQI
26th May 2025158 AMAQI
26th May 2025159 AMAQI
26th May 20252210 AMAQI
26th May 20251611 AMAQI
26th May 20251612 PMAQI
26th May 2025151 PMAQI
26th May 2025152 PMAQI
26th May 2025143 PMAQI
26th May 2025134 PMAQI
26th May 2025145 PMAQI
26th May 2025146 PMAQI
26th May 2025157 PMAQI
26th May 2025158 PMAQI
26th May 2025169 PMAQI
26th May 20251510 PMAQI
26th May 20251411 PMAQI
27th May 20251412 AMAQI
27th May 2025151 AMAQI
27th May 2025162 AMAQI
27th May 2025153 AMAQI
27th May 2025164 AMAQI
16°C14/19°C
27th May 2025165 AMAQI
27th May 2025156 AMAQI
27th May 2025157 AMAQI
27th May 2025168 AMAQI
27th May 2025189 AMAQI
27th May 20251910 AMAQI
27th May 20252011 AMAQI
27th May 20252212 PMAQI
27th May 2025241 PMAQI
27th May 2025242 PMAQI
27th May 2025223 PMAQI
27th May 2025254 PMAQI
27th May 2025215 PMAQI
27th May 2025196 PMAQI
27th May 2025227 PMAQI
27th May 2025218 PMAQI
27th May 2025209 PMAQI
27th May 20252210 PMAQI
27th May 20252111 PMAQI
28th May 20252012 AMAQI
28th May 2025221 AMAQI
28th May 2025212 AMAQI
20°C11/30°C
5 AM
12 PM
8 PM
12 AM
4 AM
N/A°C/°C
Day time
Avg. Highest Time
5 AM - 6 PM
20AQI
14 hours / Day
420 hours / Month
Avg. Lowest Time
7 PM
18AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 6 PM (Avg. 20), while the lowest AQI was between 7 PM to 7 PM (Avg. 18).
Night time
Avg. Highest Time
2 AM - 9 PM
19AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
12 AM - 1 AM
18AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 2 AM to 9 PM (Avg. 19), while the lowest AQI was between 12 AM to 1 AM (Avg. 18).
2025 Days Vs Air Quality
Portland, Oregon, United States
2025
97%
142
3%
4
Total number of days with different AQI categories in last 148 days in 2025 (217 days remaining)
Good
142 DaysModerate
4 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 148 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
28AQI
28AQI
2nd January 2025
22AQI
22AQI
3rd January 2025
23AQI
23AQI
4th January 2025
21AQI
21AQI
5th January 2025
21AQI
21AQI
6th January 2025
22AQI
22AQI
7th January 2025
23AQI
23AQI
8th January 2025
26AQI
26AQI
9th January 2025
26AQI
26AQI
10th January 2025
29AQI
29AQI
11th January 2025
23AQI
23AQI
12th January 2025
30AQI
30AQI
13th January 2025
41AQI
41AQI
14th January 2025
40AQI
40AQI
15th January 2025
39AQI
39AQI
16th January 2025
44AQI
44AQI
17th January 2025
45AQI
45AQI
18th January 2025
33AQI
33AQI
19th January 2025
37AQI
37AQI
20th January 2025
32AQI
32AQI
21st January 2025
47AQI
47AQI
22nd January 2025
53AQI
53AQI
23rd January 2025
50AQI
50AQI
24th January 2025
44AQI
44AQI
25th January 2025
38AQI
38AQI
26th January 2025
34AQI
34AQI
27th January 2025
30AQI
30AQI
28th January 2025
37AQI
37AQI
29th January 2025
44AQI
44AQI
30th January 2025
53AQI
53AQI
31st January 2025
35AQI
35AQI
1st February 2025
21AQI
21AQI
2nd February 2025
25AQI
25AQI
3rd February 2025
28AQI
28AQI
4th February 2025
31AQI
31AQI
5th February 2025
30AQI
30AQI
6th February 2025
32AQI
32AQI
7th February 2025
29AQI
29AQI
8th February 2025
27AQI
27AQI
9th February 2025
37AQI
37AQI
10th February 2025
31AQI
31AQI
11th February 2025
31AQI
31AQI
12th February 2025
26AQI
26AQI
13th February 2025
23AQI
23AQI
14th February 2025
26AQI
26AQI
15th February 2025
31AQI
31AQI
16th February 2025
22AQI
22AQI
17th February 2025
20AQI
20AQI
18th February 2025
21AQI
21AQI
19th February 2025
22AQI
22AQI
20th February 2025
23AQI
23AQI
21st February 2025
22AQI
22AQI
22nd February 2025
25AQI
25AQI
23rd February 2025
23AQI
23AQI
24th February 2025
30AQI
30AQI
25th February 2025
30AQI
30AQI
26th February 2025
28AQI
28AQI
27th February 2025
25AQI
25AQI
28th February 2025
30AQI
30AQI
1st March 2025
33AQI
33AQI
2nd March 2025
22AQI
22AQI
3rd March 2025
26AQI
26AQI
4th March 2025
35AQI
35AQI
5th March 2025
44AQI
44AQI
6th March 2025
50AQI
50AQI
7th March 2025
47AQI
47AQI
8th March 2025
51AQI
51AQI
9th March 2025
51AQI
51AQI
10th March 2025
46AQI
46AQI
11th March 2025
45AQI
45AQI
12th March 2025
35AQI
35AQI
13th March 2025
30AQI
30AQI
14th March 2025
32AQI
32AQI
15th March 2025
27AQI
27AQI
16th March 2025
27AQI
27AQI
17th March 2025
24AQI
24AQI
18th March 2025
22AQI
22AQI
19th March 2025
22AQI
22AQI
20th March 2025
17AQI
17AQI
21st March 2025
16AQI
16AQI
22nd March 2025
21AQI
21AQI
23rd March 2025
19AQI
19AQI
24th March 2025
20AQI
20AQI
25th March 2025
24AQI
24AQI
26th March 2025
21AQI
21AQI
27th March 2025
18AQI
18AQI
28th March 2025
18AQI
18AQI
29th March 2025
17AQI
17AQI
30th March 2025
23AQI
23AQI
31st March 2025
19AQI
19AQI
1st April 2025
21AQI
21AQI
2nd April 2025
18AQI
18AQI
3rd April 2025
22AQI
22AQI
4th April 2025
26AQI
26AQI
5th April 2025
20AQI
20AQI
6th April 2025
26AQI
26AQI
7th April 2025
16AQI
16AQI
8th April 2025
15AQI
15AQI
9th April 2025
18AQI
18AQI
10th April 2025
20AQI
20AQI
11th April 2025
19AQI
19AQI
12th April 2025
17AQI
17AQI
13th April 2025
20AQI
20AQI
14th April 2025
20AQI
20AQI
15th April 2025
25AQI
25AQI
16th April 2025
21AQI
21AQI
17th April 2025
21AQI
21AQI
18th April 2025
23AQI
23AQI
19th April 2025
28AQI
28AQI
20th April 2025
18AQI
18AQI
21st April 2025
16AQI
16AQI
22nd April 2025
19AQI
19AQI
23rd April 2025
21AQI
21AQI
24th April 2025
25AQI
25AQI
25th April 2025
33AQI
33AQI
26th April 2025
27AQI
27AQI
27th April 2025
20AQI
20AQI
28th April 2025
16AQI
16AQI
29th April 2025
22AQI
22AQI
30th April 2025
19AQI
19AQI
1st May 2025
25AQI
25AQI
2nd May 2025
27AQI
27AQI
3rd May 2025
20AQI
20AQI
4th May 2025
18AQI
18AQI
5th May 2025
19AQI
19AQI
6th May 2025
21AQI
21AQI
7th May 2025
23AQI
23AQI
8th May 2025
21AQI
21AQI
9th May 2025
23AQI
23AQI
10th May 2025
21AQI
21AQI
11th May 2025
15AQI
15AQI
12th May 2025
19AQI
19AQI
13th May 2025
20AQI
20AQI
14th May 2025
23AQI
23AQI
15th May 2025
24AQI
24AQI
16th May 2025
24AQI
24AQI
17th May 2025
19AQI
19AQI
18th May 2025
15AQI
15AQI
19th May 2025
16AQI
16AQI
20th May 2025
12AQI
12AQI
21st May 2025
15AQI
15AQI
22nd May 2025
21AQI
21AQI
23rd May 2025
16AQI
16AQI
24th May 2025
16AQI
16AQI
25th May 2025
17AQI
17AQI
26th May 2025
16AQI
16AQI
35AQI
27AQI
29AQI
21AQI
19AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202526AQI
29
2
28
29
2
30
26
142
4
Highest AQI recorded in
January35AQI
Lowest AQI recorded in
May19AQI
202423AQI
31
29
31
30
31
30
31
31
28
2
31
29
1
31
363
3
Highest AQI recorded in
December29AQI
Lowest AQI recorded in
May17AQI
202325AQI
29
2
25
3
31
30
31
30
31
30
1
30
30
1
29
31
357
7
Highest AQI recorded in
August30AQI
Lowest AQI recorded in
April20AQI
202227AQI
31
20
2
30
1
30
31
30
25
3
26
3
19
10
2
29
1
28
3
302
20
2
Highest AQI recorded in
October47AQI
Lowest AQI recorded in
May16AQI
202129AQI
14
16
1
17
9
2
29
2
30
31
30
31
30
1
30
31
29
1
31
333
29
2
1
Highest AQI recorded in
January60AQI
Lowest AQI recorded in
May19AQI
202035AQI
12
1
21
18
30
31
31
19
3
2
4
2
27
4
25
5
31
245
13
2
4
2
Highest AQI recorded in
September93AQI
Lowest AQI recorded in
June22AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2020(Avg.)
35AQILeast Polluted Year Recorded
2024(Avg.)
23AQIPortland's annual 2025 AQI (26) shows an average percentage change of -2.77% (improved AQI) compared to previous years: 2020 (35), 2021 (29), 2022 (27), 2023 (25), 2024 (23).