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
10.9 µg/m³
WHO guideline 15
PM10
11.6 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
10:00 PM
💨
PM2.5 10.9 µg/m³
45Good
11:00 PM
💨
PM2.5 10.7 µg/m³
45Good
12:00 AM
💨
PM2.5 10.5 µg/m³
44Good
1:00 AM
💨
PM2.5 10 µg/m³
42Good
2:00 AM
💨
PM2.5 9.3 µg/m³
39Good
3:00 AM
💨
PM2.5 8.4 µg/m³
35Good
4:00 AM
💨
PM2.5 7.7 µg/m³
32Good
5:00 AM
💨
PM2.5 6.9 µg/m³
29Good
6:00 AM
💨
PM2.5 6.4 µg/m³
27Good
7:00 AM
💨
PM2.5 5.8 µg/m³
24Good
8:00 AM
💨
PM2.5 4.9 µg/m³
23Good
9:00 AM
💨
PM2.5 5 µg/m³
27Good
Next few days
daily max · US EPA AQI
Wed
💨
Moderate · UV Very high
83
Thu
💨
Moderate · UV Very high
73
Fri
💨
Moderate · UV High
51
Sun
💨
Moderate · UV High
55