How is pollution controlled?

State whether the following statements are true or false:
$(1)$ Mist is produced by particles of spread liquid and by condensation of vapour in air.
$(2)$ Particulate matter of size up to $5 \ \mu m$ reaches directly into the lungs.
$(3)$ Ozone and nitric oxide cause irritation in the nose and throat.

How is ozone formed in photochemical smog?

Smog is caused by the presence of which of the following?

Fluoride ions make the enamel of teeth much harder by converting which of the following substances/compounds?

Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?