Tourists have fun at an indoor ice-and-snow theme park within Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Feb. 27, 2025. The world's largest indoor ice-and-snow theme ...
Indoor air purification improved pulmonary health ... Among 79 kids living in Mengzhou City in China, the time-weighted personal fine particulate matter concentration decreased by 45.14% during ...