Air quality in Johnston
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
3.7 µg/m³
WHO guideline 15
PM10
3.8 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
2:00 AM
💨
PM2.5 3.7 µg/m³
19 Good
3:00 AM
💨
PM2.5 3.2 µg/m³
19 Good
4:00 AM
💨
PM2.5 3 µg/m³
19 Good
5:00 AM
💨
PM2.5 2.8 µg/m³
18 Good
6:00 AM
💨
PM2.5 2.7 µg/m³
17 Good
7:00 AM
💨
PM2.5 2.8 µg/m³
16 Good
8:00 AM
💨
PM2.5 3.2 µg/m³
16 Good
9:00 AM
💨
PM2.5 3.5 µg/m³
16 Good
10:00 AM
💨
PM2.5 3.6 µg/m³
17 Good
11:00 AM
💨
PM2.5 3.6 µg/m³
19 Good
12:00 PM
💨
PM2.5 3.6 µg/m³
21 Good
1:00 PM
💨
PM2.5 3.5 µg/m³
24 Good
Next few days daily max · US EPA AQI
Wed
💨
Good · UV Moderate
27
Fri
💨
Good · UV Moderate
34
Sat
💨
Good · UV Moderate
47
Sun
💨
Good · UV Moderate
26
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain