What is the air quality trend in Maryland Heights?

Over the past 3 days, Maryland Heights had an average AQI of 55 based on station measurements. The worst day was 2026-07-20 with AQI 66.

How is Maryland Heights air quality measured?

Air quality in Maryland Heights 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 Maryland Heights, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

44h

PM2.5 Station

44h · 6 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	52	52–52	12.5 µg/m³	1h	6
2026-07-21	47	26–66	11.9 µg/m³	21h	5
2026-07-20	66	25–118	20.0 µg/m³	22h	4

Back to Maryland Heights Air Quality