Stay updated with real-time air quality in Monroe, Washington featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
24
Good
Monroe, Washington
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
2.04 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
17.73 μg/m³
0
55
155
255
425
605+
26.01 ppb
0
55
71
86
201
201+
0.23 ppb
0
36
76
186
605
1005+
5.30 ppb
0
54
101
361
1250
2050+
0.11 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Monroe, Washington
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AQI 20
Good
3.12μg/m³
PM2.5
17.00μg/m³
PM10
22.07ppb
O3
0.12ppb
SO2
4.71ppb
NO2
0.13ppm
CO
AQI 20
Good
3.05μg/m³
PM2.5
9.81μg/m³
PM10
22.10ppb
O3
0.12ppb
SO2
4.70ppb
NO2
0.12ppm
CO
AQI 23
Good
4.00μg/m³
PM2.5
15.03μg/m³
PM10
24.92ppb
O3
0.12ppb
SO2
4.71ppb
NO2
0.13ppm
CO
AQI 20
Good
2.68μg/m³
PM2.5
8.49μg/m³
PM10
21.69ppb
O3
0.12ppb
SO2
4.68ppb
NO2
0.12ppm
CO
AQI 22
Good
3.65μg/m³
PM2.5
10.13μg/m³
PM10
23.46ppb
O3
0.12ppb
SO2
4.03ppb
NO2
0.12ppm
CO
AQI 22
Good
4.15μg/m³
PM2.5
10.36μg/m³
PM10
23.59ppb
O3
0.12ppb
SO2
4.03ppb
NO2
0.12ppm
CO
The air quality data for Washington, USA is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.
Source: Ambee Data Sources
Air quality updates for Monroe, Washington are available every hour.
Monroe, Washington experienced its worst air quality at 10:00:00, 2026-04-21.
The best air quality in Monroe, Washington was observed at 04:00:00 on 2026-04-22.
The air quality in Monroe, Washington right now is Good, with an AQI of 27.
In Monroe, Washington, PM2.5 is the most frequently found pollutant.
When air quality in Monroe, Washington is compromised, staying indoors and wearing a mask can reduce health risks.
Monroe, Washington currently has a PM2.5 concentration of 5.253 μg/m3.
Monroe, Washington currently has a PM10 concentration of 19.355 μg/m3.
The current carbon monoxide (CO) level in Monroe, Washington is 0.128 ppm.
The current sulfur dioxide (SO2) concentration in Monroe, Washington is 0.124 ppb.
Monroe, Washington currently has an ozone (O3) concentration of 28.334 ppm.
The current level of nitrogen dioxide (NO2) in Monroe, Washington is 5.135 ppb.
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