Air quality in San Marcos
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
14.3 µg/m³
WHO guideline 15
PM10
18.9 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
12:00 PM
💨
PM2.5 14.3 µg/m³
56Moderate
1:00 PM
💨
PM2.5 14.7 µg/m³
56Moderate
2:00 PM
💨
PM2.5 14.3 µg/m³
56Moderate
3:00 PM
💨
PM2.5 13.6 µg/m³
54Moderate
4:00 PM
💨
PM2.5 12.9 µg/m³
53Moderate
5:00 PM
💨
PM2.5 12.5 µg/m³
52Moderate
6:00 PM
💨
PM2.5 12.6 µg/m³
52Moderate
7:00 PM
💨
PM2.5 12.8 µg/m³
52Moderate
8:00 PM
💨
PM2.5 13.4 µg/m³
54Moderate
9:00 PM
💨
PM2.5 14.4 µg/m³
56Moderate
10:00 PM
💨
PM2.5 16.3 µg/m³
60Moderate
11:00 PM
💨
PM2.5 18.4 µg/m³
64Moderate
Next few days
daily max · US EPA AQI
Fri
💨
Moderate · UV Very high
64
Sat
💨
Moderate · UV High
76
Sun
💨
Moderate · UV High
62
Mon
💨
Moderate · UV Very high
66
Tue
💨
Moderate · UV Very high
66