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-FN2

Air pollution from fossil fuel combustion includes particulate matter less than 2.5 (PM2.5) or 10 (PM10) microns, nitrogen dioxide (NO2), nitric oxide (NO), sulfur dioxide (SO2), carbon monoxide (CO), traffic-related air pollution, polycyclic aromatic hydrocarbons (PAH), and ground-level ozone (formed through chemical reactions from precursors from fossil fuel burning and other sources that include nitrogen oxides [NOx] and volatile organic compounds [VOCs] in the presence of sunlight).