Air Quality Management - Air and Noise Pollution - Environmental Science & Engineering Previous Year Questions

An industrial stack emits 100 g/s of CO at an effective height of 'H', where the wind speed is 5 m/s. At 3 km distance downwind, the values of dispersion coefficient in y-direction and z-direction are 50 m and 25 m, respectively. The CO concentration at the centerline of the plume at 3 km distance downwind is __________ mg/m³ (rounded off to 2 decimal places).
Use Gaussian plume model and value of π = 3.14. Neglect reactions and the ground effect of plume in the calculations.

Consider the following statements
(i) Environmental pollutant concentration is generally modeled using lognormal distribution.
(ii) Environmental pollutant concentration is generally modeled using Poisson distribution.
(iii) The weekly rate of exceedance of environmental pollutant concentration with regards to a given standard is generally modeled using lognormal distribution.
(iv) The weekly rate of exceedance of environmental pollutant concentration with regards to a given standard is generally modeled using Poisson distribution.
Choose the correct option(s) from the following

Stubble burning results in release of particulate matter, volatile organic compounds, oxides of nitrogen and sulfur, to name a few. A researcher is planning to use a conventional Gaussian dispersion model to estimate the contribution of stubble burning in a nearby state to air pollution in New Delhi.
Choose the option(s) which could explain the possible limitations in this approach

A wind rose is a representation of meteorological conditions. Which of the following is/are included in this representation?

The sub index values of NO₂, SO₂ and PM₁₀ are 80, 80 and 100, respectively. According to the National Air Quality Index (NAQI) released by the Government of India in the year 2015, the overall NAQI is

In a 30 m³ room, a stove in operation consumes wood at the rate of 0.25 kg/h. The inflow and outflow rate of air in the room is the same, i.e. 500 m³/h. This stove emits a VOC species at a rate of 0.2 g/kg-wood. The VOC species gets converted to CO₂ at a rate of 0.4 per hour. Given: (i) the air in the room is completely mixed, (ii) initial concentration of the VOC species in the room is negligible, and (iii) concentration of the VOC species in the air entering the room is negligible. The concentration of the VOC species due to two hours of stove operation in the room is __________ (in μg/m³, rounded off to one decimal place).

Which ONE of the following options CORRECTLY matches the Criteria Air Pollutants with measurement methods used in Continuous Ambient Air Quality Monitoring Stations (CAAQMS) operated by Central Pollution Control Board (CPCB) given in the table?

Criteria Air Pollutants	Measurement Methods
(P) Sulphur Dioxide (SO2, in µg/m3)	(i) Chemiluminescence
(Q) Nitrogen Dioxide (NO2, in µg/m3)	(ii) Non Dispersive Infra Red (NDIR) spectroscopy
(R) Particulate Matter (PM2.5, in µg/m3)	(iii) Ultraviolet fluorescence
(S) Carbon Monoxide (CO, in mg/m3)	(iv) Beta attenuation

Which of the following options is/are CORRECT assumption(s) in the Gaussian plume dispersion model?