What is the air quality trend in Salem?

Over the past 8 days, Salem had an average AQI of 73 based on station measurements. The worst day was 2026-07-17 with AQI 113.

How is Salem air quality measured?

Air quality in Salem 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 Salem, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

111h

PM2.5 Station

111h · 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	23	15–32	5.6 µg/m³	3h	1
2026-07-21	44	10–111	12.3 µg/m³	12h	2
2026-07-20	78	11–182	30.8 µg/m³	16h	1
2026-07-19	75	34–153	24.0 µg/m³	17h	2
2026-07-18	101	26–178	42.9 µg/m³	17h	1
2026-07-17	113	14–267	64.2 µg/m³	15h	2
2026-07-16	109	36–266	51.2 µg/m³	19h	2
2026-07-15	48	33–99	12.6 µg/m³	12h	2

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