Respiratory Issues Health Risks Wildfire Smoke Respiratory Diseases Environmental Impact Effects on Health Health Costs Fossil Fuels Air Quality Index Health Advisories 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 Particulate Matter Smoke Exposure Nitrogen Dioxide Premature Deaths Soot Particles Ground-Level Ozone PM2.5 Environmental Justice Pollutants Regulatory Goals 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 Mortality Rates Environmental Health