Address Pollution - a free air quality report for your address

According to their about page:

addresspollution.org uses data from Imperial College London to give every address in the United Kingdom an accurate, annualised reading of PM2.5, PM10 and Nitrogen Dioxide. An easy to understand Air Quality Report then details the specific health costs for living there.

After presenting you with your report, addresspollution.org makes it easy to demand estate agents and property websites disclose air quality ratings to renters and buyers at the earliest opportunity. Everyone has a right to know what they’re breathing.

This is a Central Office of Public Interest initiative. COPI is a registered Community Interest Company (CIC) that runs campaigns for people and the planet, not profits.

Their FAQ page gives recommendations on how to reduce pollution.