We are demanding cleaner buses after our tests found pollution levels in Southwark more than double legal limit. We have  launched a petition demanding London Mayor Sadiq Khan take action this year to clean up every bus driving through Camberwell Green.

Pollution monitors placed around Southwark by local members recorded levels of nitrogen dioxide at more than twice the legal EU limit outside McDonalds on Denmark Hill. Just two of the 20 locations monitored for the full month of February fell within the legal limit.

Air pollution affects everyone, and we must take real steps to reduce levels of nitrogen dioxide and particulates. This means steps like: fewer journeys by car, cleaner buses and taxis, insulation on homes to reduce the emissions from heating.

George Monbiot wrote a helpful summary of the damage that air pollution is doing to children's health and gave permission for others to reprint it. We have added some advice about how you can protect yourself by reducing your exposure, for example by taking back roads instead of main roads.