What is the air quality trend in Granite City?

Over the past 15 days, Granite City had an average AQI of 32 based on station measurements. The worst day was 2026-05-18 with AQI 43.

How is Granite City air quality measured?

Air quality in Granite City 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 Granite City, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

328h

PM2.5 Station

328h · 4 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	30	14–50	7.1 µg/m³	17h	3
2026-05-28	32	22–56	7.7 µg/m³	24h	4
2026-05-27	33	8–56	8.0 µg/m³	24h	4
2026-05-26	30	17–58	7.2 µg/m³	24h	4
2026-05-25	29	12–49	7.0 µg/m³	24h	4
2026-05-24	35	13–65	8.5 µg/m³	24h	3
2026-05-23	25	14–38	6.0 µg/m³	24h	4
2026-05-22	24	9–38	5.6 µg/m³	24h	3
2026-05-21	26	17–40	6.3 µg/m³	24h	3
2026-05-20	27	8–40	6.5 µg/m³	24h	4
2026-05-19	33	19–54	8.1 µg/m³	24h	3
2026-05-18	43	23–70	10.8 µg/m³	24h	3
2026-05-17	37	10–54	8.9 µg/m³	22h	3
2026-05-16	42	24–69	10.5 µg/m³	21h	4
2026-05-15	40	36–44	9.7 µg/m³	4h	4

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