A case study on the chemical compositions and health risk of PM 2.5

Object In the present study, we carried out a case study on the hour variation of chemical compositions in PM 2.5 collected in Gwangju, South Korea, during the high loading PM 2.5 period. We also developed the advanced DALYs that can be used as a more practical health-impact assessment index of PM 2.5 . Methods Particle sampling and simultaneous determination of its chemical compositions were taken place on the roof (13.5 m) of the Honam area air pollution intensive monitoring site (35.15°N; 126.81°E). In this study, we developed a method for calculating DALYs PM / Deposition PM2.5 (g) by age as a new health impact assessment index of PM 2.5 . For calculating the DALYs PM / Deposition PM2.5 (g) at first, the lifetime Deposition PM2.5 (g) was calculated, and then the DALYs PM / Deposition PM2.5 (g) was calculated by dividing the DALYs PM by ∑_i = 0^Death Deposition_PM2.5 i ( g ) For the calculation of the lifetime Deposition PM2.5 (g), the average PM 2.5 concentration (23 µg/m 3 ) in Gwangju in 2016 [28] was applied. Results The concentrations of Pb, Cr, Mn, As, and Cd in PM 2.5 on the event day were 18.1, 7.6, 1.9, 7.6 and 2.0 times higher than those of non-event day, respectively. Pb concentration accounted for 70.6