Stay updated with real-time air quality in Clayton, 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)
22
Good
Clayton, Missouri
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.44 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
20.06 μg/m³
0
55
155
255
425
605+
20.65 ppb
0
55
71
86
201
201+
0.36 ppb
0
36
76
186
605
1005+
7.45 ppb
0
54
101
361
1250
2050+
0.28 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Clayton, Missouri
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AQI 22
Good
4.38μg/m³
PM2.5
20.06μg/m³
PM10
18.92ppb
O3
0.35ppb
SO2
7.60ppb
NO2
0.27ppm
CO
AQI 22
Good
4.26μg/m³
PM2.5
18.69μg/m³
PM10
18.80ppb
O3
0.36ppb
SO2
7.42ppb
NO2
0.27ppm
CO
AQI 27
Good
4.56μg/m³
PM2.5
19.59μg/m³
PM10
19.06ppb
O3
0.35ppb
SO2
7.99ppb
NO2
0.27ppm
CO
AQI 27
Good
4.55μg/m³
PM2.5
19.50μg/m³
PM10
18.91ppb
O3
0.36ppb
SO2
7.95ppb
NO2
0.27ppm
CO
AQI 22
Good
4.16μg/m³
PM2.5
17.39μg/m³
PM10
18.76ppb
O3
0.40ppb
SO2
7.24ppb
NO2
0.27ppm
CO
AQI 22
Good
4.36μg/m³
PM2.5
22.83μg/m³
PM10
20.34ppb
O3
0.23ppb
SO2
6.65ppb
NO2
0.24ppm
CO
Air quality measurements for Missouri, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Air quality data for Clayton, Missouri is updated on an hourly basis.
The worst air quality in Clayton, Missouri was recorded at 06:00:00 on 2026-06-07.
The best air quality in Clayton, Missouri was recorded at 11:00:00 on 2026-06-08.
The real-time air quality index in Clayton, Missouri is 22, currently categorized as Good.
The most common pollutant in Clayton, Missouri is PM2.5.
If the air quality in Clayton, Missouri is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Clayton, Missouri at present are 4.437 μg/m3.
The current PM10 levels in Clayton, Missouri are 20.057 μg/m3.
The current carbon monoxide (CO) level in Clayton, Missouri is 0.277 ppm.
The current sulfur dioxide (SO2) levels in Clayton, Missouri are 0.363 ppb.
The current ozone (O3) levels at Clayton, Missouri is 20.654 ppm.
The current nitrogen dioxide (NO2) levels at Clayton, Missouri is 7.447 ppb.
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