I've created an app for the Watch and iPhone that gives you real-time info for air quality. It can even notify you when the air quality reaches a certain category (Unhealthy, Moderate, etc)
It's currently available only in the U.S. but is expanding to the UK soon
http://fresh-air-app.com/
It's currently available only in the U.S. but is expanding to the UK soon
http://fresh-air-app.com/