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photochemical oxidants
from nitrous dioxide
carbon monoxide
comes from incomplete combustion
sulfur dioxide
sea spray, fossil fuel combustion
nitrous oxide
comes from fossil fuels, and land use
particulates
particles below 2.5nm come from aerosols, dust, ash
lead
used to put in gas (tetraethalead)
hydrocarbons
octane, butane, methane, oil, coal