What is the air quality trend in Fort Smith?

Over the past 15 days, Fort Smith had an average AQI of 42 based on station measurements. The worst day was 2026-07-17 with AQI 86.

How is Fort Smith air quality measured?

Air quality in Fort Smith 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 Fort Smith, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

301h

PM2.5 Station

301h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	55	24–98	15.1 µg/m³	16h	2
2026-07-20	55	28–110	15.3 µg/m³	18h	2
2026-07-19	48	16–152	13.5 µg/m³	22h	2
2026-07-18	64	25–134	19.4 µg/m³	18h	2
2026-07-17	86	21–187	36.5 µg/m³	21h	2
2026-07-16	45	21–106	11.7 µg/m³	23h	2
2026-07-15	35	15–59	8.4 µg/m³	23h	3
2026-07-14	34	13–51	8.2 µg/m³	24h	2
2026-07-13	29	11–54	7.1 µg/m³	22h	2
2026-07-12	28	14–49	6.8 µg/m³	22h	2
2026-07-11	33	21–56	8.1 µg/m³	21h	3
2026-07-10	32	17–48	7.7 µg/m³	23h	3
2026-07-09	37	16–54	8.8 µg/m³	24h	2
2026-07-08	30	8–48	7.2 µg/m³	23h	2
2026-07-07	29	29–29	6.9 µg/m³	1h	3

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