What is the air quality trend in Heyan?

Over the past 7 days, Heyan had an average AQI of 70 based on station measurements. The worst day was 2026-10-15 with AQI 85.

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

125h

PM2.5 Station

125h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-20	67	13–93	20.1 µg/m³	16h	2
2026-10-19	61	25–81	17.6 µg/m³	21h	2
2026-10-18	65	16–182	23.4 µg/m³	18h	1
2026-10-17	47	27–75	12.2 µg/m³	18h	2
2026-10-16	83	53–142	26.8 µg/m³	17h	2
2026-10-15	85	26–121	28.3 µg/m³	19h	2
2026-10-14	83	49–147	27.1 µg/m³	16h	2

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