of hydrogen and carbon(passive) are composedHydrocarbons
of only hydrogen and carbon(passive) are composedHydrocarbons
of only carbon and hydrogen(passive) are composedHydrocarbons
of Carbon and hydrogen(passive) are composedHydrocarbons
of Carbon and hydrogen(passive) are composed Hydrocarbons
of hydrogen and carbon(passive) are composed Hydrocarbons
of only hydrogen and carbon(passive) are composedHydrocarbons Hydrocarbons
a complex mixturecomposedof hydrocarbons
only of the elements carbon and hydrogen(passive) are composedHydrocarbons
the conventional fuelcomposedof hydrocarbons
The processcauseshydrocarbons
cancercan causecancer
cancercan causecancer
cancercausecancer
from the formationoriginatingfrom the formation
to smog and ozone formation in the lower atmospherecontributeto smog and ozone formation in the lower atmosphere
smog and pollutioncausesmog and pollution
it to swell and softenwill causeit to swell and soften
to smogcontributeto smog
to the formation of ozone and the resulting smog problemcontributeto the formation of ozone and the resulting smog problem
to the formation of photochemical smog , acid deposition and elevated CO levels and these pollutantscontributeto the formation of photochemical smog , acid deposition and elevated CO levels and these pollutants
to smog in urban areasdo contributeto smog in urban areas
to the formation of ground - level ozone ( smogcontributeto the formation of ground - level ozone ( smog