Air pollution and particulate matter (PM2.5, PM10) research represents the most extensive body of evidence documenting how these microscopic particles cause widespread health damage across all age groups. Studies consistently show that particulate matter exposure contributes to respiratory disease, cardiovascular problems, cancer, and premature mortality, with no safe threshold identified below current standards. The evidence reveals how these particles penetrate deep into the lungs and bloodstream, affecting virtually every organ system. Explore the comprehensive research showing why particulate matter is considered the most dangerous component of air pollution.