Question

The correct set of species responsible for photochemical smog is:
A.$NO,N{{O}_{2}},N{{O}_{3}}$ and hydrocarbons
B.${{N}_{2}},{{O}_{2}},{{O}_{3}}$ and hydrocarbons
C.${{N}_{2}},N{{O}_{2}}$ and hydrocarbons
D.$C{{O}_{2}},N{{O}_{2}},S{{O}_{2}}$ and hydrocarbons

Answer 1

Hint:. Photochemical smog is often defined as a sort of smog produced when UV from the sun reacts directly with oxides of an element present within the atmosphere. It's visible as a brown haze, and may be seen most prominently during the morning and afternoon, especially in densely populated and warm cities.

Complete step by step answer:
Photochemical smog can be said as a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) present within the atmosphere react to sunlight, creating a brown haze above cities. It tends to occur more often in summer, because that's once we get the most sunlight.
The major undesirable components of photochemical smog consists of gas ($N{{O}_{2}}$), ozone (${{O}_{3}}$), PAN (peroxyacetyl nitrate), and chemical compounds which mainly contain the –CHO group (aldehydes). PAN and aldehydes can cause eye irritation and plant damage if their concentrations are present in high amounts.
$N{{O}_{2}}$, ozone and PANs are called photochemical oxidants because they will react and oxidize certain compounds within the atmosphere or within human lungs that aren't oxidized. In Photochemical smog formation; sunlight reacts with $N{{O}_{2}}$ present in air which then interacts with other molecules within the air to create smog.
The common component of photochemical smog includes concentration of ozone, gas, acrolein, formaldehyde and peroxyacetyl nitrate (PAN).
So, the correct answer is “Option A”.

Note: Even short-term exposure to photochemical smog ends up in ill effects on both the young and also the elderly. It causes painful irritation of the systema respiratorium, reduces lung function and difficulty in breathing; this can be more evident while doing exercises or working outdoors.