Age- and season-specific effects of ambient particles (PM

Ambient PMWe collected daily records of all-cause emergency department visits (EDVs) and ground measurements of ambient air pollutants and meteorological factors in Guangzhou and Shenzhen, China, 2015-2016. Case-crossover design and conditional logistic regression models were used to comparatively assess the short-term effects of ambient PMPMOur study added comparative evidence for increased EDVs risks associated with short-term exposures to ambient PM