Sex or age-specific percent increase of daily mortality of Beijing residents associated with an IQR increase of CO, NO₂ and PM₁₀, using 8 df/year.^a

aWe applied current-day (lag 0 day) temperature and relative humidity and 2-day moving average of air pollutant concentrations (lag01), and applied 3 df to temperature, humidity and barometric pressure. *P<0.05.