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

In the context of water and wastewater treatments, the correct statements are:

Which of the following statements is/are TRUE for the aerobic composting of sewage sludge?

The theoretical aerobic oxidation of biomass (C₅H₇O₂N) is given below:

C₅H₇O₂N + 5O₂ → 5CO₂ + NH₃ + 2H₂O

The biochemical oxidation of biomass is assumed as a first-order reaction with a rate constant of 0.23/d at 20ºC (logarithm to base e). Neglecting the second-stage oxygen demand from its biochemical oxidation, the ratio of BOD₅ at 20ºC to total organic carbon (TOC) of biomass is _______ (round off to two decimal places).

[Consider the atomic weights of C, H, O and N as 12 g/mol, 1 g/mol, 16 g/mol and 14 g/mol, respectively