What is the air quality trend in Longmen?

Over the past 15 days, Longmen had an average AQI of 62 based on station measurements. The worst day was 2026-05-21 with AQI 74.

How is Longmen air quality measured?

Air quality in Longmen 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 Longmen, China

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

321h

PM2.5 Station

321h · 4 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	50	22–61	13.2 µg/m³	4h	3
2026-05-29	62	33–129	17.9 µg/m³	23h	3
2026-05-28	60	37–112	17.0 µg/m³	23h	3
2026-05-27	66	36–124	19.5 µg/m³	24h	3
2026-05-26	64	41–96	18.4 µg/m³	22h	3
2026-05-25	57	37–85	15.3 µg/m³	23h	3
2026-05-24	67	36–99	19.7 µg/m³	23h	3
2026-05-23	70	27–155	21.4 µg/m³	24h	3
2026-05-22	64	38–96	18.3 µg/m³	24h	3
2026-05-21	74	40–124	23.1 µg/m³	24h	3
2026-05-20	59	25–92	16.6 µg/m³	23h	3
2026-05-19	62	29–102	17.6 µg/m³	24h	3
2026-05-18	57	27–89	15.8 µg/m³	23h	3
2026-05-17	54	24–76	14.6 µg/m³	21h	3
2026-05-16	70	27–111	21.6 µg/m³	16h	3

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