Question

Photochemical smog causes _________.

• A. irritation in the eyes and lungs leading to respiratory diseases
• B. irritation to lungs leading to respiratory diseases
• C. both $A$ and $B$
• D. irritation to hands

Answer 1

The correct option is C both $A$ and $B$

Hydrocarbons in air by themselves alone cause no harmful effects. However, they undergo chemical reactions in the presence of sunlight and nitrogen oxides. They form photochemical oxidants leading to photochemical smog. This causes irritation in the eyes and lungs leading to respiratory diseases. Hence option C is correct.