What is the air quality trend in Downtown DC?

Over the past 7 days, Downtown DC had an average AQI of 87 based on station measurements. The worst day was 2026-07-17 with AQI 168.

How is Downtown DC air quality measured?

Air quality in Downtown DC 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 Downtown DC, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Downtown DC, 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 · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	53	28–75	14.4 µg/m³	24h	28
2026-07-20	67	45–83	20.0 µg/m³	24h	29
2026-07-19	62	38–89	18.1 µg/m³	24h	31
2026-07-18	130	58–161	50.8 µg/m³	24h	31
2026-07-17	168	57–227	99.5 µg/m³	24h	32
2026-07-16	80	54–197	30.2 µg/m³	24h	31
2026-07-15	51	35–81	13.1 µg/m³	23h	32

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