Air quality in Merrillville
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
3.1 µg/m³
WHO guideline 15
PM10
3.1 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
6:00 PM
💨
PM2.5 3.1 µg/m³
30 Good
7:00 PM
💨
PM2.5 3.2 µg/m³
29 Good
8:00 PM
💨
PM2.5 3.3 µg/m³
29 Good
9:00 PM
💨
PM2.5 4.1 µg/m³
27 Good
10:00 PM
💨
PM2.5 5.2 µg/m³
25 Good
11:00 PM
💨
PM2.5 6.4 µg/m³
27 Good
12:00 AM
💨
PM2.5 7.7 µg/m³
32 Good
1:00 AM
💨
PM2.5 9.1 µg/m³
38 Good
2:00 AM
💨
PM2.5 10.4 µg/m³
43 Good
3:00 AM
💨
PM2.5 11.4 µg/m³
48 Good
4:00 AM
💨
PM2.5 13.9 µg/m³
55 Moderate
5:00 AM
💨
PM2.5 16.4 µg/m³
60 Moderate
Next few days daily max · US EPA AQI
Mon
💨
Moderate · UV Low
69
Tue
💨
Moderate · UV Low
55
Wed
💨
Moderate · UV Low
54
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain