Which of the following is NOT a source of natural air pollution?
Automobile pollution is anthropogenic because vehicle operation is a human activity that emits carbon monoxide, nitrogen oxides, hydrocarbons, particulate matter, and carbon dioxide. Volcanoes naturally release ash and gases; lightning, wildfires of natural origin, sea spray, and biological particles also affect air composition. Pollen is a natural aerosol produced by plants, although it can provoke allergy and worsen respiratory symptoms. Atmospheric inversions can trap contaminants near the surface, while wind, turbulence, precipitation, and chemical transformation determine their eventual d
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology