Photos can convey a message in an instant. But how do you photograph something which day-to-day is invisible to see: air pollution? A new stunning collection of photography on air pollution is compelling action on climate change. From the bustling streets of Indonesia to the industrial heartlands of Poland, these photos capture the stark effects of dirty air on the communities hit hardest, as well as spotlighting solutions already making a difference to people. Climate Curious speaks to Alastair Johnstone from Climate Outreach to discuss why the ways we visualise climate issues really matters.