19 Cities Including London, San Francisco, Hong Kong Achieve ‘Remarkable Reductions’ in Air Pollution
In an inspiring report analyzing the air quality of 100 cities around the globe, it has been revealed that 19 cities have made remarkable strides in improving their air quality since 2010. Among these success stories, nine cities are located in China and Hong Kong, while the remaining are dispersed across Europe, showcasing a mix of both large and small urban areas. Notably, in the United States, San Francisco has achieved significant reductions in harmful fine particulate matter (PM2.5) as well as airway-irritating nitrogen dioxide (NO2). PM2.5, which consists of tiny particles measuring just 2.5 micrometers in diameter, poses a












