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
AD 728×90

Air Quality Index Trend

47h · 3 stn

Merrillville'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▲
57
15.03 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Merrillville?

Temperature & Precipitation

PM2.5 Trend

47h · 3 stations
PM2.515.03 µg/m³ ✓ WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX10.9
Extreme
AD 300×250
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
18.3 km PM2.5: 21.1 µg/m³
61
Hegewisch 3
25.3 km PM2.5: 16.7 µg/m³
63
Hegewisch 4
26.1 km PM2.5: 17.7 µg/m³
58
Hegewisch 2
26.5 km PM2.5: 15.3 µg/m³
63
Hegewisch 5
26.5 km PM2.5: 17.6 µg/m³
62
Hegewisch 6
27.1 km PM2.5: 17.2 µg/m³
60
Hegewisch 1
27.5 km PM2.5: 16.6 µg/m³
73
South Deering 6
27.8 km PM2.5: 22.7 µg/m³
61
East Side 4
28.4 km PM2.5: 17.0 µg/m³
32
Washington HS Collocation 2
28.5 km PM2.5: 7.6 µg/m³

What cities are near Merrillville?

57 Crown Point 57 Hobart 60 Griffith 60 Schererville 58 Gary 59 Highland 60 Dyer 58 Portage 59 Munster 59 Hammond
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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.