Looks like no one added any tags here yet for you.
Photochemical smog
NO2 reacts with sunlight = NO + O
O + O2 = O3
NO + VOCS = photochemical oxidants
Photochemical oxidants + O3 = photochemical smog
Ozone
O + O2 = O3
Sulfuric acid
SO2 + O2 = SO3
SO3 + H2O = H2SO4
Nitric acid
NO + O2 = NO2
NO2 + H2O = HNO3
Carbonic acid
CO2 + H20 = H2CO3
Acid rain
Combustion
C3H8 (fuel) + 5O2 = 3CO2 + 4H20
Burning of coal
C + O2 > CO2 + H2O
Burning of natural gas
CH4 + O2 > CO2 + H2O
Burning gasoline
C8H18 + O2 > CO2 + H2O