Ncert Exercises & Solutions

Which of the following statements about photochemical smog is wrong?

1.	It has high concentration of oxidising agents
2.	It has low concentration of oxidising agent
3.	It can be controlled by controlling the release of NO₂, hydrocarbons, ozone etc.
4.	Plantation of some plants like pinus helps in controlling photochemical smog

Photochemical smog or Los Angles smog was first observed in Los Angeles in 1950. It is formed due to photochemical reactions taking place when air contains NO₂ and hydrocarbons.

The concentrations of O₃, PAN, RCHO and R₂CO builds up in the atmosphere. These compounds produce irritation in the eyes. Photochemical smog has high concentration of oxidants such as O₃, organic oxidant etc.

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