What is the air quality trend in Chico?

Over the past 8 days, Chico had an average AQI of 37 based on station measurements. The worst day was 2026-05-22 with AQI 44.

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

166h

PM2.5 Station

166h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	33	19–57	7.9 µg/m³	21h	6
2026-05-27	35	16–60	8.5 µg/m³	24h	4
2026-05-26	38	24–81	9.8 µg/m³	24h	6
2026-05-25	35	19–56	8.6 µg/m³	24h	6
2026-05-24	36	23–50	8.6 µg/m³	24h	6
2026-05-23	42	23–65	10.6 µg/m³	24h	6
2026-05-22	44	28–161	12.4 µg/m³	24h	6
2026-05-21	39	39–39	9.3 µg/m³	1h	5

Back to Chico Air Quality