Every child in London is breathing toxic air, mainly caused by polluting road vehicles. Together with the Mayor, Sadiq Khan, we are committed to helping Londoners breathe cleaner air.
We're asking Londoners to swap little trips that don't need the car and walk, cycle or take public transport instead. Changing one of these journeys a week where you can will help clean up London's air. See how you can do your bit and swap that trip.
The volume of road traffic in London makes it one of the most polluted places in the UK - an estimated 5.8 million journeys are made by car every day.
Road vehicles are the main cause of London's air pollution. They produce around half of all nitrogen oxides and emit tiny particles - like small bits of rubber and metal - into the air we breathe.
These harmful gases and particles can pass through the nose and throat, enter our bloodstream and harm our organs. This contributes to thousands of premature deaths and increases people's risk of heart and lung disease and asthma.
Myth: Only central London is affected by air pollution
FACT: Pollution affects every borough in the city, not just central London
Myth: Road vehicles aren't the main cause of London's air pollution
FACT: Driving polluting vehicles is the single biggest cause, contributing to around half of the air pollution in London
Children are particularly vulnerable to the effects of poor air quality. Children growing up in heavily polluted streets have a smaller lung capacity than those in cleaner areas. This can't be reversed.
As Londoners, we all have a role to play in improving our city's air quality. By 2041 we want 80% of trips in London to be made on foot, by cycling or by public transport.
This is a big task, but we can do our bit by making small changes to the way we travel.
Londoners make millions of trips every day that are short enough to walk and cycle, or have a public transport alternative. Short leisure journeys like popping to the shops or a trip to the gym, cinema or visiting friends could be swapped once a week, where possible, to help clean up London's air.
Myth: You don't need to switch off a car engine when stationary
FACT: Research shows that turning off the engine significantly reduces pollution levels in the surrounding area
Myth: You can always see when air pollution is bad in London
FACT: Most airborne toxins are invisible to the naked eye
We're helping to clean London's air by, for example, running the Ultra Low Emission Zone (ULEZ) in central London, cleaning up our bus fleet and taxis, and supporting small businesses and charities to switch to cleaner vehicles.