Air quality in Maryland Heights
The US Air Quality Index (EPA) grades air from 0 to 500 using fine particles (PM2.5/PM10), ozone and nitrogen dioxide. 0-50 is Good, 51-100 Moderate, 101-150 Unhealthy for Sensitive Groups, and anything higher affects everyone.
PM2.5
13 µg/m³
WHO guideline 15
PM10
13.4 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
1:00 AM
💨
PM2.5 13 µg/m³
53Moderate
2:00 AM
💨
PM2.5 11.7 µg/m³
49Good
3:00 AM
💨
PM2.5 10.5 µg/m³
44Good
4:00 AM
💨
PM2.5 9.7 µg/m³
40Good
5:00 AM
💨
PM2.5 8.8 µg/m³
37Good
6:00 AM
💨
PM2.5 8.3 µg/m³
35Good
7:00 AM
💨
PM2.5 8.3 µg/m³
35Good
8:00 AM
💨
PM2.5 9.3 µg/m³
39Good
9:00 AM
💨
PM2.5 10 µg/m³
42Good
10:00 AM
💨
PM2.5 10.5 µg/m³
47Good
11:00 AM
💨
PM2.5 8.1 µg/m³
66Moderate
12:00 PM
💨
PM2.5 8.3 µg/m³
91Moderate
Next few days
daily max · US EPA AQI
Sat
💨
Unhealthy for Sensitive Groups · UV High
110
Sun
💨
Unhealthy for Sensitive Groups · UV Very high
124
Mon
💨
Unhealthy for Sensitive Groups · UV Very high
119
Tue
💨
Unhealthy for Sensitive Groups · UV Very high
122
Wed
💨
Good · UV Very high
37