London’s low emission zone is working – so why are cities around the world so cautious about clean air?

What we know now

London’s low emission zone is working – so why are cities around the world so cautious about clean air?. The Guardian reports: The club have a fresh development, according to The Guardian. This is the only report tracked here so far, logged on 23 August.

Latest: The Guardian, 23 August: The club have a fresh development, according to The Guardian.