What is the air quality trend in Caldwell?

Over the past 15 days, Caldwell had an average AQI of 131 based on station measurements. The worst day was 2026-07-27 with AQI 213.

How is Caldwell air quality measured?

Air quality in Caldwell 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 Caldwell, United States

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

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

146

Current AQI
Unhealthy for sensitive groups CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

302h

PM2.5 Station

302h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	165	165–165	82.6 µg/m³	1h	1
2026-08-07	142	109–170	61.5 µg/m³	20h	1
2026-08-06	105	80–152	37.2 µg/m³	23h	1
2026-08-05	110	88–129	39.0 µg/m³	22h	1
2026-08-04	150	86–184	64.5 µg/m³	23h	1
2026-08-03	101	22–176	39.2 µg/m³	22h	1
2026-08-02	56	17–96	15.8 µg/m³	23h	1
2026-08-01	86	61–130	28.4 µg/m³	23h	1
2026-07-31	132	61–185	60.7 µg/m³	22h	1
2026-07-30	142	75–173	59.8 µg/m³	20h	1
2026-07-29	162	129–177	79.5 µg/m³	23h	1
2026-07-28	173	103–217	105.2 µg/m³	21h	1
2026-07-27	213	135–300	152.7 µg/m³	21h	1
2026-07-26	168	49–231	110.4 µg/m³	24h	1
2026-07-25	66	48–83	19.5 µg/m³	14h	1

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