A team of scientists including Prof Sergey Nizkorodov review how carbon can brown the color of smog.

A team of scientists including Dr. Alexander Laskin (PNNL), Dr. Julia Laskin (PNNL) and Dr. Sergey Nizkorodov (UCI) published a Chemical Reviews article on the chemistry of atmospheric "brown carbon", atmospheric aerosol contributing to the brown color of smoggy air. The authors presented a comprehensive summary of field observations, laboratory experiments, and modeling studies describing the potential effects of brown carbon on air pollution and climate.

A. Laskin, J. Laskin and S.A. Nizkorodov, "Chemistry of atmospheric brown carbon"

Chem. Rev. published on-line (2015) DOI:10.1021/cr5006167