What is the air quality trend in Los Altos?

Over the past 3 days, Los Altos had an average AQI of 23 based on station measurements. The worst day was 2026-07-21 with AQI 28.

How is Los Altos air quality measured?

Air quality in Los Altos 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 Los Altos, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

47h

PM2.5 Station

47h · 101 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	20	20–21	4.9 µg/m³	1.1	2h	104
2026-07-21	28	24–54	6.8 µg/m³	4.9	24h	101
2026-07-20	22	5–65	5.3 µg/m³	3.0	21h	94

Back to Los Altos Air Quality