question_answer

Richa was enjoying the winter fog when her mother ask her to come inside and close the doors. Mother told Richa that actually it is not fog, but a mixture of harmful gases. Can you explain Richa what exactly it is?

Answer:

It was smog which is a mixture of smoke and fog. It is yellow or blackish fog formed by a mixture of condensed water vapour, dust, smoke and gases like \[S{{O}_{2}},{{H}_{2}}S,N{{O}_{2}},\] etc. It causes necrosis in plants, allergies, asthma and bronchitis in humans.