Carbon monoxide causes:
$I.$ Giddiness
$II.$ Headache
$III.$ Decreased vision
$IV.$ Cardiovascular malfunction
$V.$ Asphyxia
Which of the statements given above are correct?

Euro-$II$ emission norms were introduced for reducing which of the following?

What is used to remove particulate matter from industrial exhaust?

Given below are two statements:
Statement $I:$ In a scrubber,the exhaust from the thermal plant is passed through a spray of water or lime to remove gases like $SO_2$.
Statement $II:$ Particulate matter $(PM\,2.5)$ cannot be removed by a scrubber but can be removed by an electrostatic precipitator.
In the light of the above statements,choose the most appropriate answer from the options given below:

Effect of pollution is observed first on

$PAN$ $(Peroxyacetyl \text{ nitrate})$ is an important constituent of photochemical smog. It is a