Air Quality Index Health Impacts Particulate Matter Health Effects Monitoring Regulatory Measures Wildfires Wildfire Smoke Pollution Effects Delhi Fine Particulate Matter Nitrogen Dioxide Delhi-NCR Contaminants Particle Pollution Fossil Fuels Carbon Emissions Pollution Control Transportation Emissions Mitigation Strategies Filtration Technologies Graded Response Action Plan Air Purifiers Government Initiatives Pollution Sources Seasonal Effects Regulatory Agencies Vehicles Health Risks Ground-level Ozone Carbon Monoxide Sulfur Dioxide Pollution Measures Ozone