More frequent and intense heatwaves and wildfires driven by climate change are expected to worsen the quality of the air we breathe, harming human health and ecosystems, the UN's World Meterological Organization warns. WMO scientic officer Lorenzo Labrador presents a new report from the the organization that cautions that the interaction between pollution and climate change would impact hundreds of millions of people over the coming century, and urges action to rein in the harm. IMAGES AND SOUNDBITES