What is the air quality trend in Walnut?

Over the past 3 days, Walnut had an average AQI of 40 based on station measurements. The worst day was 2026-08-06 with AQI 51.

How is Walnut air quality measured?

Air quality in Walnut 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 Walnut, United States

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

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

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

47h

PM2.5 Station

47h · 1 station

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	25	21–33	6.0 µg/m³	6.2	4h	1
2026-08-07	46	21–68	11.7 µg/m³	12.9	24h	1
2026-08-06	51	29–66	12.8 µg/m³	14.1	19h	1

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