Air quality in Castle Rock
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
1.9 µg/m³
WHO guideline 15
PM10
2.4 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
1:00 PM
💨
PM2.5 1.9 µg/m³
49 Good
2:00 PM
💨
PM2.5 1.8 µg/m³
48 Good
3:00 PM
💨
PM2.5 1.8 µg/m³
45 Good
4:00 PM
💨
PM2.5 1.8 µg/m³
41 Good
5:00 PM
💨
PM2.5 2.6 µg/m³
37 Good
6:00 PM
💨
PM2.5 4 µg/m³
33 Good
7:00 PM
💨
PM2.5 4.9 µg/m³
28 Good
8:00 PM
💨
PM2.5 5.4 µg/m³
26 Good
9:00 PM
💨
PM2.5 5.7 µg/m³
25 Good
10:00 PM
💨
PM2.5 6.1 µg/m³
25 Good
11:00 PM
💨
PM2.5 6 µg/m³
25 Good
12:00 AM
💨
PM2.5 5.7 µg/m³
26 Good
Next few days daily max · US EPA AQI
Thu
💨
Good · UV Moderate
49
Fri
💨
Good · UV Moderate
49
Sun
💨
Good · UV Moderate
43
Mon
💨
Good · UV Moderate
26
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain