What is the air quality trend in Hayward?

Over the past 8 days, Hayward had an average AQI of 28 based on station measurements. The worst day was 2026-10-18 with AQI 35.

How is Hayward air quality measured?

Air quality in Hayward 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 Hayward, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 101 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	34	32–35	8.1 µg/m³	—	2h	102
2026-10-20	20	16–35	4.7 µg/m³	5.4	24h	89
2026-10-19	23	20–28	5.4 µg/m³	11.7	24h	102
2026-10-18	35	24–48	8.4 µg/m³	20.3	24h	94
2026-10-17	30	24–39	7.3 µg/m³	12.8	24h	105
2026-10-16	31	23–35	7.3 µg/m³	12.3	24h	100
2026-10-15	27	24–34	6.6 µg/m³	12.3	24h	108
2026-10-14	25	22–30	6.0 µg/m³	12.0	19h	108

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