A settling chamber is used for the removal of discrete particulate matter from air with following conditions. Horizontal velocity of air $=0.2 \mathrm{~m} / \mathrm{s}$; Temperature of air stream $=77^{\circ} \mathrm{C}$; Specific gravity of particle to be removed $=2.65$; Chamber length $=12 \mathrm{~m}$; Chamber height = 2 m ;
Viscosity of air at $77^{\circ} \mathrm{C}=2.1 \times 10^{-5} \mathrm{~kg} / \mathrm{m} . \mathrm{s}$;
Acceleration due to gravity $(\mathrm{g})=9.81 \mathrm{~m} / \mathrm{s}^2$; Density of air at $77^{\circ} \mathrm{C}=1.0 \mathrm{~kg} / \mathrm{m}^3$;
Assume the density of water as $1000 \mathrm{~kg} / \mathrm{m}^3$ and Laminar condition exists in the chamber.
The minimum size of particle that will be removed with 100\% efficiency in the settling chamber (in $\mu \mathrm{m}$ ) is ___________ (round off to one decimal place).
Match the following air pollutants with the most appropriate adverse health effects :
| Air pollutant | Health effect to human and/or test animal |
|---|---|
| (P) Aromatic hydrocarbons | (IV) Carcinogenic effect |
| (Q) Carbon monoxide | (I) Reduce the capability of the blood to carry oxygen |
| (R) Sulfur oxides | (II) Bronchitis and pulmonary emphysema |
| (S) Ozone | (III) Damage of chromosomes |
A sample of air analyzed at 25$$^\circ$$C and 1 atm pressure is reported to contain 0.04 ppm of SO2. Atomic mass of S = 32. O = 16. The equivalent SO2 concentration (in $$\mu$$g/m2) will be __________. (round off to the nearest integer)