What is the air quality trend in Decatur?

Over the past 15 days, Decatur had an average AQI of 31 based on station measurements. The worst day was 2026-07-09 with AQI 46.

How is Decatur air quality measured?

Air quality in Decatur 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 Decatur, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	28	13–45	6.6 µg/m³	1.5	5h	3
2026-07-21	25	1–56	6.2 µg/m³	2.5	24h	3
2026-07-20	26	8–67	6.3 µg/m³	4.3	24h	3
2026-07-19	37	4–62	9.1 µg/m³	9.4	24h	3
2026-07-18	30	8–67	7.5 µg/m³	4.2	24h	3
2026-07-17	28	15–57	6.8 µg/m³	7.0	24h	3
2026-07-16	37	15–64	9.0 µg/m³	10.4	24h	3
2026-07-15	30	14–55	7.3 µg/m³	6.2	24h	3
2026-07-14	43	4–290	17.8 µg/m³	1.2	23h	3
2026-07-13	22	4–45	5.3 µg/m³	3.9	24h	3
2026-07-12	26	8–58	6.3 µg/m³	5.1	24h	3
2026-07-11	27	9–49	6.6 µg/m³	6.9	24h	3
2026-07-10	36	7–60	8.8 µg/m³	10.0	24h	3
2026-07-09	46	17–259	17.4 µg/m³	11.5	24h	3
2026-07-08	38	18–55	9.1 µg/m³	13.1	17h	3

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