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
7.3 µg/m³
WHO guideline 15
PM10
7.7 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
10:00 PM
💨
PM2.5 7.3 µg/m³
30 Good
11:00 PM
💨
PM2.5 7 µg/m³
29 Good
12:00 AM
💨
PM2.5 6.4 µg/m³
27 Good
1:00 AM
💨
PM2.5 5.7 µg/m³
24 Good
2:00 AM
💨
PM2.5 5.1 µg/m³
21 Good
3:00 AM
💨
PM2.5 4.4 µg/m³
21 Good
4:00 AM
💨
PM2.5 3.9 µg/m³
20 Good
5:00 AM
💨
PM2.5 3.6 µg/m³
20 Good
6:00 AM
💨
PM2.5 3.7 µg/m³
18 Good
7:00 AM
💨
PM2.5 4.6 µg/m³
19 Good
8:00 AM
💨
PM2.5 5.5 µg/m³
23 Good
9:00 AM
💨
PM2.5 5.1 µg/m³
27 Good
Next few days daily max · US EPA AQI
Thu
💨
Good · UV Moderate
49
Fri
💨
Good · UV Moderate
50
Sun
💨
Moderate · UV Moderate
60
Mon
💨
Moderate · UV Moderate
58
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain