Stay updated with real-time air quality in Affton, Missouri 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)
27
Good
Affton, Missouri
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.40 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
17.46 μg/m³
0
55
155
255
425
605+
29.39 ppb
0
55
71
86
201
201+
1.10 ppb
0
36
76
186
605
1005+
4.61 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Affton, Missouri
Affton, Missouri
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AQI 26
Good
2.59μg/m³
PM2.5
12.19μg/m³
PM10
27.98ppb
O3
0.79ppb
SO2
5.28ppb
NO2
0.20ppm
CO
AQI 25
Good
1.86μg/m³
PM2.5
8.51μg/m³
PM10
27.16ppb
O3
0.79ppb
SO2
5.64ppb
NO2
0.20ppm
CO
AQI 25
Good
2.04μg/m³
PM2.5
9.46μg/m³
PM10
27.42ppb
O3
0.80ppb
SO2
5.50ppb
NO2
0.20ppm
CO
AQI 27
Good
2.48μg/m³
PM2.5
12.22μg/m³
PM10
28.93ppb
O3
0.81ppb
SO2
4.78ppb
NO2
0.20ppm
CO
AQI 25
Good
2.80μg/m³
PM2.5
12.05μg/m³
PM10
27.23ppb
O3
0.78ppb
SO2
5.79ppb
NO2
0.20ppm
CO
AQI 26
Good
2.73μg/m³
PM2.5
12.61μg/m³
PM10
27.70ppb
O3
0.78ppb
SO2
5.43ppb
NO2
0.20ppm
CO
Air quality data and pollutant measurements for Missouri, 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 Affton, Missouri is updated every hour.
The worst air quality in Affton, Missouri in the last 24 hours was observed at 03:00:00 on 2026-09-06.
In the last 24 hrs, the best air quality in Affton, Missouri was observed at 12:00:00 on 2026-09-07.
The current air quality in Affton, Missouri is 27, categorized as Good based on real-time data.
The most common pollutant in Affton, Missouri is O3.
If the air quality in Affton, Missouri is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Affton, Missouri is 4.401 μg/m3.
The current PM10 concentration at Affton, Missouri is 17.465 μg/m3.
The current carbon monoxide (CO) concentration at Affton, Missouri is 0.2 ppm.
The current sulfur dioxide (SO2) concentration at Affton, Missouri is 1.099 ppb.
The current ozone (O3) concentration at Affton, Missouri is 29.385 ppm.
The current nitrogen dioxide (NO2) concentration at Affton, Missouri is 4.605 ppb.
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