What is the air quality trend in Littleton?

Over the past 3 days, Littleton had an average AQI of 17 based on station measurements. The worst day was 2026-09-04 with AQI 18.

How is Littleton air quality measured?

Air quality in Littleton 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 Littleton, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

45h

PM2.5 Station

45h · 38 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-09-05	18	15–22	4.4 µg/m³	21.1	17h	38
2026-09-04	18	14–22	4.2 µg/m³	42.2	24h	38
2026-09-03	15	14–15	3.6 µg/m³	22.5	4h	38

Back to Littleton Air Quality