What is the air quality trend in Caldwell?

Over the past 20 days, Caldwell had an average AQI of 44 based on station measurements. The worst day was 2026-07-21 with AQI 146.

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.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

420h

PM2.5 Station

420h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	146	83–171	60.7 µg/m³	18h	1
2026-07-20	140	77–169	60.4 µg/m³	23h	1
2026-07-19	104	81–147	36.6 µg/m³	23h	1
2026-07-18	79	25–113	26.6 µg/m³	22h	1
2026-07-17	57	18–124	17.5 µg/m³	23h	1
2026-07-16	28	18–52	6.6 µg/m³	20h	1
2026-07-15	28	16–43	6.7 µg/m³	23h	1
2026-07-14	25	17–106	6.6 µg/m³	21h	1
2026-07-13	35	18–51	8.5 µg/m³	24h	1
2026-07-12	28	15–52	6.8 µg/m³	24h	1
2026-07-11	22	14–40	5.2 µg/m³	23h	1
2026-07-10	25	20–32	6.0 µg/m³	24h	1
2026-07-09	20	14–52	4.9 µg/m³	20h	1
2026-07-08	24	18–37	5.9 µg/m³	21h	1
2026-07-07	35	17–67	8.6 µg/m³	22h	1
2026-07-06	25	15–36	6.0 µg/m³	10h	1
2026-07-05	28	16–93	7.4 µg/m³	23h	1
2026-07-04	19	14–45	4.4 µg/m³	23h	1
2026-07-03	16	14–29	3.8 µg/m³	22h	1
2026-07-02	14	14–15	3.4 µg/m³	11h	1

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