When it comes to tackling air pollution - the greatest environmental threat to health, causing seven million premature deaths per year – “everyone can do something” to help prevent it.

That’s the view of Tiy Chung, of the UN Environment Programme’s (UNEP) Climate and Clean Air Coalition, marking World Environment Day, on 5 June.

In an interview with Li Zhang of UN News, he outlined how people can switch from being part of the problem, to part of the solution, and how the Chinese capital Beijing had successfully cut pollution in recent years.