Characteristics, potential regional sources and health risk of black carbon based on ground observation and MERRA-2 reanalysis data in a coastal city, China

Black carbon (BC) produced by the incomplete combustion of carbonaceous materials and biomass has become a major factor affecting global climate change adversely affects health. Based on ground-measured data MERRA-2 (Modern-Era Retrospective Analysis for Research Applications, Version 2) reanalysis data, BC's pollution characteristics health risks caused BC exposure were investigated in Tianjin, China. The results showed that highest concentration occurred winter, annual average weekends was higher than weekdays winter. hourly monitoring variations four seasons all had two peaks appeared 6:00–8:00 22:00–2:00. For there one peak during 5:00–7:00 seasons. lowest values 14:00–16:00 both MERRA-2. relationships between meteorological factors wind speed temperature inversion played important roles atmospheric diffusion. directions southwest, southeast, north closely associated with 2019. Potential Source Contribution Function (PSCF) southwestern area especially southern Hebei, northern Henan Beijing, would be potential source areas Tianjin cancer adults children risk levels (1 × 10−6 to 1 10−4) recommended US Environmental Protection Agency (US EPA) 2019, resulting more 3.78 cases per 10,000 (3.78 10−4), 1.55 (1.55 respectively. relative (RR) mortality winter summer. Compared all-cause cardiovascular mortality, respiratory risk.