What is the air quality trend in Chico?

Over the past 15 days, Chico had an average AQI of 36 based on station measurements. The worst day was 2026-07-10 with AQI 50.

How is Chico air quality measured?

Air quality in Chico 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 Chico, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

330h

PM2.5 Station

330h · 5 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	37	18–70	9.3 µg/m³	22h	3
2026-07-20	39	17–73	10.2 µg/m³	23h	3
2026-07-19	35	20–75	8.6 µg/m³	24h	3
2026-07-18	37	22–56	8.9 µg/m³	24h	3
2026-07-17	48	17–405	23.5 µg/m³	24h	3
2026-07-16	36	22–52	8.7 µg/m³	23h	3
2026-07-15	38	17–69	9.4 µg/m³	24h	4
2026-07-14	37	17–64	9.0 µg/m³	24h	3
2026-07-13	28	17–44	6.8 µg/m³	24h	3
2026-07-12	28	17–46	6.7 µg/m³	23h	3
2026-07-11	30	13–75	7.6 µg/m³	22h	2
2026-07-10	50	23–366	22.3 µg/m³	24h	3
2026-07-09	34	20–70	8.4 µg/m³	24h	3
2026-07-08	33	16–53	8.0 µg/m³	24h	3
2026-07-07	40	40–40	9.7 µg/m³	1h	3

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