____ is fuel combustion from vehicles and engines. ____ is a secondary pollutant formed by chemical reaction of volatile organic compounds (VOCs) and NOx in the presence of sunlight. ____ - combustion of leaded gasoline in piston engine aircraft; waste incinerators (waste burners), and battery manufacturing. ____ is fuel combustion (electric utilities, big industrial boilers, vehicles) and wood burning. ____, this is formed through chemical reactions, fuel combustion (e.g., burning coal, wood, diesel), industrial processes, farming (plowing, field burning), and unpaved roads or during road constructions. ____ comes from fuel combustion (especially high-sulfur coal); electric utilities and industrial processes as well as natural occurrences like volcanoes.

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