Rainmatter Foundation
Know the air
you’re breathing
A free Chrome extension that puts live air quality in your toolbar — powered by OAQ and OpenAQ, built for Indian cities.
Features
Everything you need,
nothing you don’t
Live & cached
Auto-refreshes in the background. Even when offline the last good reading is always visible.
Dual API support
Connects to OpenAQ v3 or Rainmatter's own OAQ platform (oaq.notf.in). Switch sources in Settings.
CPCB AQI
Displays indicative AQI using India's official CPCB breakpoints across six pollution categories.
Page overlay
Optional floating badge on any webpage shows the current AQI at a glance without opening the popup.
Private by design
API key stays on your device only. No tracking, no analytics, no data ever leaves your browser.
Open source
MIT licensed. Audit the code, run it locally, or contribute — everything is on GitHub.
Screenshots
See it in action
Popup dashboard
Settings page
Page overlay
Setup
Up and running in minutes
Install the extension
Add Rainmatter Air from the Chrome Web Store with one click.
Enter your API key
Sign up for a free OAQ or OpenAQ key and paste it in Settings.
Pick your station
Set your city and station ID. The extension does the rest.
Data
Trusted data sources
Connect to Rainmatter’s own OAQ network or the global OpenAQ platform. Switch sources anytime from Settings.
OAQ — oaq.notf.in
Rainmatter’s own air-quality platform aggregating data from CPCB, Aurassure, and Airnet sensor networks across Indian cities.
Get an API key →OpenAQ v3
Open global air quality data covering 100+ countries. Use a numeric location ID from explore.openaq.org to connect.
Learn more →Live air quality
India AQI map
Showing demo data for major cities. Enter your OAQ API key to pull live readings.
Start breathing
with awareness
Free, open source, and takes under two minutes to set up.