Toggle navigation
Places
AQI (US)
AQC (Australia)
AQHI (Canada)
AQI (China)
AQI (Netherlands)
AQI (US)
CAQI (Europe)
AQI (UK)
AQI (India)
English
Français
Deutsch
日本語
한국어
简体中文
繁體中文
North America
United States
California
San Mateo County
Emerald Hills
AQI (US)
AQC (Australia)
AQHI (Canada)
AQI (China)
AQI (Netherlands)
AQI (US)
CAQI (Europe)
AQI (UK)
AQI (India)
Emerald Hills
San Mateo County, California
2024-09-21 09:00
AQI (US)
Good
Pollutants
|
Pollens
O3
μg/m³
23.6
PM2.5
μg/m³
2
NO2
μg/m³
13.1
CO
μg/m³
500
Pollen
5.8
Weather
℃
℃
℉
14℃
92%
7 kph
0 of 11
Historical Data
Hourly
Hourly
Daily
AQI (US)
AQI (US)
Pollen
O3
PM2.5
NO2
CO
Data Sources
http://www.airnow.gov/
Get the App
Scan QR Code
Air Matters
Realtime broadcasting air quality information on your phone for more than 180 countries.
iPhone, iPad
Android
Scan QR Code to Download App
iOS
Google Play
Download APK
Cities Nearby
Emerald Hills
AQI 10
Redwood City
AQI 10
Woodside
AQI 10
San Carlos
AQI 10
Atherton
AQI 10
Belmont
AQI 10
North Fair Oaks
AQI 10
West Menlo Park
AQI 10
Menlo Park
AQI 10
Portola Valley
AQI 10
Highlands-Baywood Park
AQI 10
Air Matters © 2024