Where there is smoke: Introduction to the virtual special issue of health impacts of wildland fire smoke exposure - Selected papers from the 2nd International Smoke Symposium

Highlights: • Public health impacts from wildland and prescribed fire presented during the Second International Smoke Symposium • Advances in research and technology improved communication of health effects due to smoke across spatiotemporal scales • Thousands of smoke-related premature deaths and illnesses in the U.S. cost tens to hundreds of billions of USD$ • Successful implementation of local to regional burn plans can reduce ozone (O3) exposure