What is the air quality trend in Gary?

Over the past 3 days, Gary had an average AQI of 80 based on station measurements. The worst day was 2026-07-20 with AQI 99.

How is Gary air quality measured?

Air quality in Gary is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Gary, United States

Name: Gary Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Gary, United States.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

48h

PM2.5 Station

48h · 4 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-21	65	32–98	19.3 µg/m³	11.6	22h	249
2026-07-20	99	63–106	34.7 µg/m³	16.4	24h	253
2026-07-19	78	52–104	24.7 µg/m³	22.3	2h	138

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