What is the air quality trend in Herndon?

Over the past 2 days, Herndon had an average AQI of 55 based on station measurements. The worst day was 2026-07-02 with AQI 80.

How is Herndon air quality measured?

Air quality in Herndon 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 Herndon, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

PM2.5 Station

3h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-06	30	30–31	7.3 µg/m³	2h	2
2026-07-02	80	80–80	25.9 µg/m³	1h	2

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