What is the air quality trend in Bethesda?

Over the past 8 days, Bethesda had an average AQI of 78 based on station measurements. The worst day was 2026-07-17 with AQI 167.

How is Bethesda air quality measured?

Air quality in Bethesda 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 Bethesda, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 3 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	22	18–26	5.3 µg/m³	4h	25
2026-07-21	52	27–74	14.2 µg/m³	24h	31
2026-07-20	69	57–79	20.5 µg/m³	24h	30
2026-07-19	66	36–151	19.8 µg/m³	24h	32
2026-07-18	130	57–160	50.2 µg/m³	24h	32
2026-07-17	167	77–212	97.8 µg/m³	24h	34
2026-07-16	68	53–146	20.0 µg/m³	24h	32
2026-07-15	51	37–66	12.9 µg/m³	19h	33

Back to Bethesda Air Quality