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
18 µg/m³
WHO guideline 15
PM10
18.9 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
5:00 AM
💨
PM2.5 18 µg/m³
63Moderate
6:00 AM
💨
PM2.5 15.7 µg/m³
59Moderate
7:00 AM
💨
PM2.5 13.9 µg/m³
55Moderate
8:00 AM
💨
PM2.5 14.7 µg/m³
56Moderate
9:00 AM
💨
PM2.5 14.8 µg/m³
57Moderate
10:00 AM
💨
PM2.5 13.9 µg/m³
106Unhealthy for Sensitive Groups
11:00 AM
💨
PM2.5 12 µg/m³
110Unhealthy for Sensitive Groups
12:00 PM
💨
PM2.5 7.6 µg/m³
90Moderate
1:00 PM
💨
PM2.5 5.8 µg/m³
71Moderate
2:00 PM
💨
PM2.5 5.1 µg/m³
68Moderate
3:00 PM
💨
PM2.5 4.6 µg/m³
68Moderate
4:00 PM
💨
PM2.5 4.2 µg/m³
66Moderate
Next few days
daily max · US EPA AQI
Sat
💨
Unhealthy for Sensitive Groups · UV Very high
110
Sun
💨
Moderate · UV High
88
Mon
💨
Unhealthy for Sensitive Groups · UV Very high
119
Tue
💨
Unhealthy for Sensitive Groups · UV Very high
145
Wed
💨
Good · UV Very high
49