Air quality in Union City
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.
US AQI · EPA
128
Unhealthy for Sensitive Groups
PM2.5
9 µg/m³
WHO guideline 15
PM10
9.4 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
2:00 PM
💨
PM2.5 9 µg/m³
128Unhealthy for Sensitive Groups
3:00 PM
💨
PM2.5 9.1 µg/m³
138Unhealthy for Sensitive Groups
4:00 PM
💨
PM2.5 9.1 µg/m³
145Unhealthy for Sensitive Groups
5:00 PM
💨
PM2.5 8.7 µg/m³
142Unhealthy for Sensitive Groups
6:00 PM
💨
PM2.5 8.5 µg/m³
128Unhealthy for Sensitive Groups
7:00 PM
💨
PM2.5 8.4 µg/m³
104Unhealthy for Sensitive Groups
8:00 PM
💨
PM2.5 11.6 µg/m³
80Moderate
9:00 PM
💨
PM2.5 15.4 µg/m³
58Moderate
10:00 PM
💨
PM2.5 16.4 µg/m³
60Moderate
11:00 PM
💨
PM2.5 16.6 µg/m³
60Moderate
12:00 AM
💨
PM2.5 17.7 µg/m³
63Moderate
1:00 AM
💨
PM2.5 18.5 µg/m³
64Moderate
Next few days
daily max · US EPA AQI
Tue
💨
Unhealthy for Sensitive Groups · UV Very high
145
Wed
💨
Unhealthy · UV Very high
153
Thu
💨
Moderate · UV Very high
70
Fri
💨
Moderate · UV Very high
61
Sat
💨
Good · UV Very high
32