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
Europe
United Kingdom
England
Hertfordshire
Saint Albans District
Harpenden West
AQI (US)
AQC (Australia)
AQHI (Canada)
AQI (China)
AQI (Netherlands)
AQI (US)
CAQI (Europe)
AQI (UK)
AQI (India)
Harpenden West
Saint Albans District, Hertfordshire
2026-04-09 04:00
AQI (US)
Moderate
Pollutants
|
Pollens
PM2.5
μg/m³
16
PM10
μg/m³
27
Birch
12.0
Alder
9.0
Ragweed
0
Mugwort
0
Olive Tree
0
Grasses
0
Weather
℃
℃
℉
11℃
90%
9 kph
0 of 11
Historical Data
Hourly
Hourly
Daily
AQI (US)
AQI (US)
Allergy Risk
PM2.5
PM10
Birch
Alder
Ragweed
Mugwort
Olive Tree
Grasses
Data Sources
http://www.polleninfo.org
http://uk-air.defra.gov.uk/
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
Harpenden West
AQI 64
Harpenden
AQI 64
Harpenden North & Rural
AQI 64
Harpenden South
AQI 64
Harpenden East
AQI 64
Redbourn
AQI 64
Sandridge & Wheathampstead
AQI 64
Sandridge
AQI 62
Batchwood
AQI 62
Bernards Heath
AQI 62
Marshalswick West
AQI 62
Air Matters © 2026