The irritant red haze in traffic and congested places is due to

How is electricity produced in a thermal power station?

When a huge amount of sewage is dumped into a river,the $BOD$ will

Identify the reactions that occur in photochemical smog.
$(i)$ $CH_2=O + H_2 \longrightarrow CH_3OH$
$(ii)$ $NO_{2(g)} \xrightarrow{h \nu} NO_{(g)} + O_{(g)}$; $O_{(g)} + O_{2(g)} \longrightarrow O_{3(g)}$
$(iii)$ $CH_4 + 2O_3 \longrightarrow CH_2=O + 2H_2O$
$(iv)$ $NO_{(g)} + O_{3(g)} \longrightarrow NO_{2(g)} + O_{2(g)}$

Which of the following causes damage to buildings containing calcium and is responsible for causing cough and throat congestion in humans?

Write down the reactions involved during the formation of photochemical smog.