Table 2.

Summary of observed sources of BrC chromophores in the ambient atmosphere.

Compound	Sources	References
CHO containing
All identified compounds containing the CHO elemental formula	Biofuel burning, cigarette smoke, cooking-related organic aerosols, biomass burning	Zhou et al. [8]; Yan et al. [7]
Bisphenol A compound	Plastic burning, incineration e-waste, and domestic waste	Vasiljevic et al. [11]
Benzoic acid, 2,5-bis(trimethylsiloxy)-, trimethylsilyl ester; 2,6-Dihydroxybenzoic acid, 3TMS derivative	Biomass combustion, emission of vehicles, and secondary chemical process of anthropogenic pollutants	Zhou et al. [8]
N containing compounds
Compounds containing CHON elemental formula	Biomass burning, secondary atmospheric process of VOCs with NOx and slightly from coal combustion	Yan et al. [7]
Both S and N containing compounds
Compounds containing CHONS elemental formula	Diesel vehicles, coal combustion, excavators, secondary chemical process of anthropogenic VOCs	Yan et al. [7]