Air Quality in Merrillville, United States
Partly Cloudy
23.6°C · 67.9% humidity
23.6°
Feels 23.6°
57
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
6 stations
Nearby Monitoring Stations
AQI Forecast
25
1pm
25
25
57
4pm
48
41
37
7pm
35
33
31
10pm
30
29
27
1am
28
55
67
4am
83
83
66
7am
54
54
83
10am
84
146
Air Quality Index Trend
47h · 3 stnMerrillville's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Merrillville is 1.0× the WHO 24-hour guideline of 15 µg/m³.
67.9%
Humidity
38.9 km/h
Wind NNE
1014.2 hPa
Pressure
10.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
15.03 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Merrillville?
Temperature & Precipitation
PM2.5 Trend
47h · 3 stationsPM2.515.03 µg/m³
✓ WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX10.9
Extreme
Station readings (6 stations within 25 km)
15.03
Median
15.2
Average
14.0
Low
15.9
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -8.8
What is the 7-day forecast for Merrillville?
07-21
27.5° 21.6°
1.69 mm
07-22
25.0° 19.9°
07-23
23.3° 16.1°
6.56 mm
07-24
26.7° 15.7°
07-25
22.9° 16.8°
0.19 mm
07-26
27.0° 19.8°
3.13 mm
07-27
25.1° 20.6°
0.88 mm
Both models agree
Avg diff: 3.5°C
Where are air quality stations near Merrillville?
70
Hammond-167th St, Indiana, USA
61
Hegewisch 3
63
Hegewisch 4
58
Hegewisch 2
63
Hegewisch 5
62
Hegewisch 6
60
Hegewisch 1
73
South Deering 6
61
East Side 4
32
Washington HS Collocation 2
What cities are near Merrillville?
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T21:28 UTC.