Differentiate between Brown air and Grey air.

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(N/A)
Brown air Grey air
$(1)$ It is a reddish-brown haze primarily containing nitrogen oxides $(NO_x)$. $(1)$ It is a grey-coloured haze primarily formed of $SO_2$,particulate matter,and smoke,often referred to as classical smog.
$(2)$ It occurs under intense solar conditions,leading to photochemical smog. $(2)$ It occurs under less intense solar conditions,often associated with industrial pollution.

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