Four out of five people in Britain are worried about air pollution, a new study has found.
Now an environmental charity has designed an art installation they hope will get people talking about how to tackle air pollution.
Hubbub's 'Pollution Pavilion' will be in Covent Garden, and hopes to show people what poor air looks like.
The heart of the installation is balloons.
The balloons visualise pollution data from across the capital - changing colour to reflect the levels.
The Mayor of London, Sadiq Khan, said: "It's great to see campaigners, businesses and academics collaborating on creative ways to help the public understand the dangers of air pollution and encourage them to take action."
We are today urging everyone to write to their local MP to get this important issue higher up on the Government's agenda