What is the air quality trend in Heyan?

Over the past 14 days, Heyan had an average AQI of 57 based on station measurements. The worst day was 2026-09-05 with AQI 78.

How is Heyan air quality measured?

Air quality in Heyan 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 Heyan, China

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

Historical PM2.5 and AQI trend from monitoring stations near Heyan, China.

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

179h

PM2.5 Station

179h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-06	66	34–85	19.6 µg/m³	12h	1
2026-09-05	78	59–107	24.7 µg/m³	12h	2
2026-09-04	66	38–142	19.2 µg/m³	16h	1
2026-09-03	59	30–119	17.3 µg/m³	12h	1
2026-09-02	61	13–95	18.3 µg/m³	11h	1
2026-09-01	47	17–95	12.4 µg/m³	16h	1
2026-08-31	43	11–85	11.6 µg/m³	14h	1
2026-08-30	48	13–89	13.0 µg/m³	13h	1
2026-08-29	61	25–156	20.0 µg/m³	10h	1
2026-08-28	56	25–80	15.2 µg/m³	11h	1
2026-08-27	53	24–113	14.7 µg/m³	14h	1
2026-08-26	72	25–151	22.7 µg/m³	10h	1
2026-08-25	43	13–63	11.1 µg/m³	14h	1
2026-08-24	50	23–89	13.9 µg/m³	14h	1

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