Question

What is photochemical smog composed of? How does it affect plants?

Answer 1

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HERE IS YOUR ANSWER, ⤵
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==> PHOTOCHEMICAL SMOG : Photochemical smog is a type of air pollution produced when sunlight acts upon motor vehicle exhaust gases to form harmful substances such as ozone (O3), aldehydes and peroxyacetylnitrate (PAN).

● Photochemical smog formation requires the following conditions:

• a still,
• sunny daytemperature inversion (pollutants accumulate in the lower inversion layer)

==> AFFECTS ON PLANTS : The ground level ozone present in the smog also inhibits plant growth and causes immense damage to crops and forests.
Crops, vegetables like soybeans, wheat, tomatoes, peanuts, and cotton are subject to infection when they are exposed to smog.
The smog results in mortifying impacts on environment by killing innumerable animal species and green life as these take time to adapt to breathing and surviving in such toxic environments. 
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Answer 2

Photochemical oxidants are found in ' photochemical smog' which is a complex mixture of primary and secondary air pollutants.