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
3.7 µg/m³
WHO guideline 15
PM10
4.1 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
6:00 AM
💨
PM2.5 3.7 µg/m³
28Good
7:00 AM
💨
PM2.5 3.6 µg/m³
26Good
8:00 AM
💨
PM2.5 3.7 µg/m³
25Good
9:00 AM
💨
PM2.5 3.4 µg/m³
26Good
10:00 AM
💨
PM2.5 2.7 µg/m³
33Good
11:00 AM
💨
PM2.5 2.1 µg/m³
42Good
12:00 PM
💨
PM2.5 1.7 µg/m³
49Good
1:00 PM
💨
PM2.5 1.5 µg/m³
53Moderate
2:00 PM
💨
PM2.5 1.4 µg/m³
53Moderate
3:00 PM
💨
PM2.5 1.3 µg/m³
53Moderate
4:00 PM
💨
PM2.5 1.4 µg/m³
55Moderate
5:00 PM
💨
PM2.5 1.9 µg/m³
56Moderate
Next few days
daily max · US EPA AQI
Tue
💨
Moderate · UV Very high
56
Wed
💨
Moderate · UV Very high
58
Thu
💨
Good · UV Very high
47
Fri
💨
Good · UV Very high
50
Sat
💨
Good · UV Very high
16