What is the air quality trend in Decatur?

Over the past 8 days, Decatur had an average AQI of 53 based on station measurements. The worst day was 2026-07-17 with AQI 116.

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

86h

PM2.5 Station

86h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	30	22–42	7.1 µg/m³	3h	1
2026-07-21	39	20–51	9.3 µg/m³	6h	2
2026-07-20	44	3–70	11.8 µg/m³	11h	1
2026-07-19	46	14–148	12.7 µg/m³	13h	1
2026-07-18	58	20–171	20.5 µg/m³	10h	1
2026-07-17	116	30–303	72.1 µg/m³	16h	1
2026-07-16	52	9–123	14.9 µg/m³	16h	1
2026-07-15	40	20–57	9.8 µg/m³	11h	1

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