From Ghana to Argentina and London, air pollution is a problem that people want to solve.
As part of the BBC’s So I Can Breathe series, people have been sharing their tips on how to improve the air around them.
For Phoebe, Joylen and Verity, from London, the answer is to stop cutting down trees.
Students at 50 London schools breathe air that exceeds legal pollution limits.
“Toxic air audits” have been announced by the mayor of London to combat the problem.
Areej also wants to plant trees in urban areas of Damascus to improve air quality.
Adboulie Sey thinks they should be banned from Gambia and solar energy promoted instead.
Improving how we travel is a common concern.
Adelaide Arthur wants to use her bike more in order to cut pollution in Accra.
Swapping driving for cycling can reduce the number of vehicles on the road emitting pollutants such as carbon monoxide.
Improved public transport is also proposed by Maria Innes in Buenos Aires, and echoed by Oscar Soria, in New York.
And finally Joab Frank Chakhaza wants to limit car imports in Malawi.
So I Can Breathe
A week of coverage by BBC News examining possible solutions to the problems caused by air pollution.