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
2.1 µg/m³
WHO guideline 15
PM10
2.4 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
8:00 PM
💨
PM2.5 2.1 µg/m³
35Good
9:00 PM
💨
PM2.5 2.6 µg/m³
31Good
10:00 PM
💨
PM2.5 3 µg/m³
29Good
11:00 PM
💨
PM2.5 2.9 µg/m³
28Good
12:00 AM
💨
PM2.5 2.8 µg/m³
28Good
1:00 AM
💨
PM2.5 2.7 µg/m³
27Good
2:00 AM
💨
PM2.5 2.6 µg/m³
26Good
3:00 AM
💨
PM2.5 2.4 µg/m³
25Good
4:00 AM
💨
PM2.5 2.3 µg/m³
22Good
5:00 AM
💨
PM2.5 2.1 µg/m³
18Good
6:00 AM
💨
PM2.5 2 µg/m³
17Good
7:00 AM
💨
PM2.5 2 µg/m³
21Good
Next few days
daily max · US EPA AQI
Thu
💨
Good · UV Very high
46
Fri
💨
Good · UV Very high
47
Sat
💨
Good · UV Very high
50
Sun
💨
Moderate · UV Very high
61