When power stations burn coal, a class of compounds called Polycyclic Aromatic Hydrocarbons, or PAHs, form part of the resulting air pollution. Researchers have found that PAHs toxins degrade in ...

and heterocyclic compounds, which are "key indoor pollutants and precursors for the formation of secondary pollutants, including aerosols and ozone." Exposure to any of these indoor pollutants ...