2) With reference to Non-Methane Hydrocarbons (NMHCs), consider the following statements:
- NMHCs are a group of volatile organic compounds (VOCs) consisting only of carbon and hydrogen, with methane excluded from the group.
- They are primarily emitted from fossil fuel combustion, vehicular exhaust, industrial processes, and biomass burning.
- In the presence of sunlight and nitrogen oxides, NMHCs contribute to the formation of ground-level ozone and photochemical smog.
- All NMHCs are chemically inert and have no direct influence on the atmospheric lifetime of greenhouse gases.
Which of the statements given above are correct?
a.
b.
c.
d.