We hear a lot about environmental damage from single-use plastics like bottles and packaging but tyre wear is also a big problem, and the focus of a team of students in the UK.
By Stav Dimitropoulos
By Adrienne Murray
Technology of Business reporter, Denmark
Reducing the particle has health benefits, but might contribute to global warming
A look at the impact of wildfire smoke, as it increasingly becomes a source of air pollution.
By Roger Harrabin
BBC environment analyst
By Steffan Messenger
BBC Wales Environment Correspondent
By Eleanor Lawrie & Ben Butcher & Daniel Wainwright