air pollution

Column I presents common air pollutants, and column II presents treatment technologies commonly employed to control air pollutants. Air pollutant 1 Dust (size 5-25 µm) 2 Carbon mon...

In an industry, a cyclone collector with 80% efficiency is installed for air purification, followed by an electrostatic precipitator with 50% efficiency. The concentration of parti...

A settling chamber is used for the removal of discrete particulate matter from air with following conditions. Horizontal velocity of air $=0.2 \mathrm{~m} / \mathrm{s}$; Temperatur...

For assessing the compliance with the emissions standards of incineration plants, a correction needs to be applied to the measured concentrations of air pollutants. The emission st...

The primary air pollutant(s) is/are

What is the CORRECT match between the air pollutants and treatment techniques given in the table? Air pollutants Treatment techniques P - NO 2 i - Flaring Q - SO 2 ii - Cyclonic se...

Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) 'Dmax' in the atmosphere?

Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) ‘D max ’ in the atmosphere?

For the elevation and temperature data given in the table, the existing lapse rate in the environment is _____ ℃/100 m (round off to two decimal places). $$ \begin{array}{|c|c|} \h...

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) Carcino...

A process equipment emits 5 kg/h of volatile organic compounds (VOCs). If a hood placed over the process equipment captures 95% of the VOCs, then the fugitive emission in kg/h is

A sample of air analyzed at 25 °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 µg/m³) will be ____...

A sample of air analyzed at 25$$^\circ$$C and 1 atm pressure is reported to contain 0.04 ppm of SO 2 . Atomic mass of S = 32. O = 16. The equivalent SO 2 concentration (in $$\mu$$g...

A process equipment emits, 5 kg/h of volatile organic compounds (VOCs). If a hood placed over the process equipment captures 95% of the VOCs, then the fugitive emission in kg/h is

The liquid forms of particulate air pollutants are

Which of the following statement(s) is/are correct?

Read the statements given below. (i) Value of the wind profile exponent for the 'very unstable' atmosphere is smaller than the wind profile exponent for the 'neutral' atmosphere. (...

A baghouse filter has to treat 12 m³/s of waste gas continuously. The baghouse is to be divided into 5 sections of equal cloth area such that one section can be shut down for clean...

A sample of air analysed at 0°C and 1 atm pressure is reported to contain 0.02 ppm (parts per million) of NO2. Assume the gram molecular mass of NO2 as 46 and its volume at 0°C and...

In the figures, Group I represents the atmospheric temperature profiles (P, Q, R and S) and Group II represents dispersion of pollutants from a smoke stack (1, 2, 3 and 4). In the...

Which one of the following is NOT present in the acid rain?

A coal containing 2% sulfur is burned completely to ash in a brick kiln at a rate of 30 kg/min. The sulfur content in the ash was found to be 6% of the initial amount of sulfur pre...