Sulfur dioxide $(S{O}_2)$ in ambient air can be measured using wet chemical method. The

detection limit of this method is supposed to be $5g$ in $50ml$ of absorbing solution. If the

sampling flow rate is $1$ liter$/$minute$,$ calculate the minimum sampling time required for the

concentration of $S{O}_2$ in ambient air is $40\frac{g}{m^3}?$

$(3$ marks$)$

A one$-$cubic meter sample of air was found to contain $100\frac{g}{m^3}$ of CO$.$ The temperature and pressure

were $25C$ and $103\mathrm{.}193$kPa when the air sample was taken. What was the CO concentration in ppm$?$

for $P$ in $Pa$ and volume in $\{$:$m^3).$ Atomic weight: $C=12,$

$O=16.$

$(3$ marks$)$

Why can't polluted air in most cases penetrate an inversion layer? Indicate the physical

principles involved.

$(2$ marks$)$

The uncontrolled emission rate of NOx from a nitric acid plant is $40k\frac{g}{?}$ ton and the controlled

emission rate is $5k\frac{g}{t}on.$ What is the collection efficiency?

$(2$ marks$)$

If you drive a car in a high$-$altitude city like Denver, what can you expect in terms of

emissions of air pollutants from the exhaust pipe?

$(2$ marks$)$