Question

what is smog how is Classical smog different from photochemical smog

Answer 1

Smog Is a combination of smoke and fog
whereas
photochemical Smog is formed when harmful gases present in smoke reacts with sunlight..

Answer 2

Smog is a mixture of dusk and fog

Classical smog are coal burning produce by vehicles and industrial whereas biological smog are those which are produced from agriculture fire and photochemical.