Respiratory Issues Health Risks Wildfire Smoke Respiratory Diseases Health Costs Fossil Fuels Effects on Health Environmental Impact Mortality Rates Major Cities Health Impacts Outdoor Air Pollution Northeast U.S. Health Impacts of Climate Change Sensitive Groups Festivals Smoke Pollution Children's Health Vulnerable Populations Impact on Children Mental Health Health Risks of Diesel Emissions Health Effects Global Health Risks Particulate Matter Smoke Exposure Nitrogen Dioxide Premature Deaths Soot Particles Ground-Level Ozone PM2.5 Environmental Justice Pollutants Regulatory Goals Respiratory Health Ozone Pollution PM2.5 Particles Carbon Emissions Reduction Climate Change Health Impacts Tailpipe Emissions In-Use Locomotive Regulation PM2.5 Levels Soot and Sulfur Dioxide Clean Air Industrial Emissions Ground-level Ozone PM2.5 Exposure Environmental Health Air Quality Index Health Advisories