What is the air quality trend in Upper Alton?

Over the past 7 days, Upper Alton had an average AQI of 65 based on station measurements. The worst day was 2026-07-17 with AQI 105.

How is Upper Alton air quality measured?

Air quality in Upper Alton 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 Upper Alton, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Upper Alton, United States.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

153h

PM2.5 Station

153h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	49	30–82	12.8 µg/m³	18h	4
2026-07-20	68	44–106	20.2 µg/m³	21h	4
2026-07-19	52	22–113	14.3 µg/m³	24h	4
2026-07-18	61	43–121	17.0 µg/m³	20h	6
2026-07-17	105	28–203	46.2 µg/m³	24h	5
2026-07-16	77	23–165	26.8 µg/m³	23h	6
2026-07-15	47	37–56	11.4 µg/m³	23h	7

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