Association between air pollution and upper respiratory tract infection in hospital outpatients aged 0-14 years in Hefei, China: a time series study

This study showed that short-term exposure to air pollution was associated with increased risk of URTI among paediatric hospital outpatients aged 0-14 years in Hefei. NO2 was the major air pollutant affecting the daily number of paediatric hospital outpatients with URTI.