Stay updated with real-time air quality in Kelso, 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)
38
Good
Kelso, Washington
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
7.37 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
32.60 μg/m³
0
55
155
255
425
605+
21.89 ppb
0
55
71
86
201
201+
0.44 ppb
0
36
76
186
605
1005+
5.96 ppb
0
54
101
361
1250
2050+
0.17 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Kelso, Washington
Kelso, Washington
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AQI 38
Good
7.43μg/m³
PM2.5
33.13μg/m³
PM10
21.62ppb
O3
0.50ppb
SO2
4.99ppb
NO2
0.21ppm
CO
AQI 66
Moderate
16.72μg/m³
PM2.5
74.15μg/m³
PM10
15.96ppb
O3
0.49ppb
SO2
4.66ppb
NO2
0.18ppm
CO
AQI 66
Moderate
16.55μg/m³
PM2.5
74.83μg/m³
PM10
16.73ppb
O3
0.49ppb
SO2
4.50ppb
NO2
0.17ppm
CO
AQI 65
Moderate
6.54μg/m³
PM2.5
84.31μg/m³
PM10
27.02ppb
O3
0.49ppb
SO2
4.49ppb
NO2
0.18ppm
CO
AQI 54
Moderate
11.04μg/m³
PM2.5
52.76μg/m³
PM10
22.21ppb
O3
0.49ppb
SO2
4.18ppb
NO2
0.16ppm
CO
AQI 58
Moderate
12.90μg/m³
PM2.5
57.45μg/m³
PM10
18.32ppb
O3
0.49ppb
SO2
4.20ppb
NO2
0.17ppm
CO
Air quality data and pollutant measurements for Washington, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for Kelso, Washington is updated every hour.
The worst air quality in Kelso, Washington in the last 24 hours was observed at 07:00:00 on 2026-08-25.
In the last 24 hrs, the best air quality in Kelso, Washington was observed at 09:00:00 on 2026-08-24.
The current air quality in Kelso, Washington is 38, categorized as Good based on real-time data.
The most common pollutant in Kelso, Washington is PM2.5.
If the air quality in Kelso, Washington is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Kelso, Washington is 7.368 μg/m3.
The current PM10 concentration at Kelso, Washington is 32.603 μg/m3.
The current carbon monoxide (CO) concentration at Kelso, Washington is 0.175 ppm.
The current sulfur dioxide (SO2) concentration at Kelso, Washington is 0.437 ppb.
The current ozone (O3) concentration at Kelso, Washington is 21.889 ppm.
The current nitrogen dioxide (NO2) concentration at Kelso, Washington is 5.965 ppb.
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