What is the air quality trend in Gary?

Over the past 21 days, Gary had an average AQI of 35 based on station measurements. The worst day was 2026-10-23 with AQI 90.

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

478h

PM2.5 Station

478h · 276 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-23	90	79–96	30.7 µg/m³	10h	276
2026-10-22	64	33–74	18.3 µg/m³	24h	267
2026-10-21	64	51–80	18.1 µg/m³	24h	278
2026-10-20	52	23–71	13.6 µg/m³	24h	245
2026-10-19	28	22–41	6.7 µg/m³	24h	278
2026-10-18	23	18–35	5.5 µg/m³	24h	256
2026-10-17	16	13–23	3.9 µg/m³	24h	278
2026-10-16	19	11–40	4.5 µg/m³	24h	267
2026-10-15	24	13–41	5.7 µg/m³	24h	278
2026-10-14	39	18–54	9.4 µg/m³	24h	279
2026-10-13	34	26–50	8.2 µg/m³	24h	278
2026-10-12	42	32–55	10.3 µg/m³	24h	278
2026-10-11	32	28–37	7.6 µg/m³	24h	278
2026-10-10	30	25–45	7.2 µg/m³	24h	241
2026-10-09	34	24–45	8.1 µg/m³	24h	246
2026-10-08	26	20–35	6.2 µg/m³	24h	269
2026-10-07	26	21–31	6.3 µg/m³	24h	257
2026-10-06	25	19–34	6.0 µg/m³	24h	256
2026-10-05	28	19–36	6.7 µg/m³	24h	269
2026-10-04	25	18–35	5.9 µg/m³	24h	247
2026-10-03	22	18–25	5.3 µg/m³	12h	270

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