What is the air quality trend in Hayward?

Over the past 15 days, Hayward had an average AQI of 29 based on station measurements. The worst day was 2026-07-16 with AQI 36.

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

335h

PM2.5 Station

335h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-21	29	12–44	7.0 µg/m³	5.1	22h	101
2026-07-20	24	18–53	5.8 µg/m³	2.8	24h	102
2026-07-19	27	21–52	6.5 µg/m³	4.3	24h	106
2026-07-18	28	22–47	6.8 µg/m³	3.4	24h	107
2026-07-17	35	32–38	8.5 µg/m³	8.7	24h	109
2026-07-16	36	30–56	8.7 µg/m³	6.8	24h	102
2026-07-15	35	30–59	8.5 µg/m³	5.9	24h	104
2026-07-14	32	29–38	7.8 µg/m³	9.1	24h	103
2026-07-13	30	26–55	7.3 µg/m³	5.4	24h	106
2026-07-12	25	20–43	6.0 µg/m³	2.7	24h	101
2026-07-11	26	18–63	6.5 µg/m³	1.8	24h	84
2026-07-10	35	28–39	8.4 µg/m³	7.0	24h	101
2026-07-09	24	14–36	5.7 µg/m³	3.0	24h	102
2026-07-08	26	24–31	6.3 µg/m³	3.3	24h	109
2026-07-07	24	24–24	5.7 µg/m³	4.2	1h	107

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