Recent questions tagged gaseous-pollutants

Which of the following chemical reactions is/are related to smog formation in the troposphere?$\mathrm{CFCl}_{3}+h v \rightarrow \mathrm{CFCl}_{2}+\mathrm{Cl} \cdot$$\mat...

Which ONE of the following options CORRECTLY matches the Criteria Air Pollutants with measurement methods used in Continuous Ambient Air Quality Monitoring Stations (CAAQ...

Which of the following options is/are CORRECT assumption(s) in the Gaussian plume dispersion model?The concentration of pollutants emitting from stack is continuous.The p...

In a stack emission measurement at an industry, the stack cross-sectional area at $30$ m height was divided into four equal sectors. The measured velocities and $\mathrm{...

​​​​​​Consider the following statementsEnvironmental pollutant concentration is generally modeled using lognormal distribution.Environmental pollutant concentration is ge...

​​​​​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...

​​​At a pressure of $1$ atmosphere and temperature of $25^{\circ} \mathrm{C}$, $365 \mu \mathrm{~g} \mathrm{~m}{ }^{-3}$ of a pollutant corresponds to mixing ratio of $13...

A boiler burns coal at a rate of $1 \mathrm{~kg} / \mathrm{s}$. If the coal has $3 \%$ sulfur content, assuming that there is no sulfur in ash, $\mathrm{SO}_{2}$ emitted ...

Which is/are the secondary air pollutant(s)?$\mathrm{O}_{3}$$\mathrm{HNO}_{3}$$\mathrm{CO}_{2}$$\mathrm{H}_{2} \mathrm{SO}_{4}$

The equipment that can be used to control particulate air pollution in an industrial unit is/areElectrostatic precipitatorcyclone separatorGravity settlerIncinerator

An industrial stack emits $100 \mathrm{~g} / \mathrm{s}$ of $\mathrm{CO}$ at an effective height of ' $\mathrm{H}$ ', where the wind speed is $5 \mathrm{~m} / \mathrm{s}$...

The sub index values of $\mathrm{NO}_{2}, \mathrm{SO}_{2}$ and $\mathrm{PM}_{10}$ are $80,80$ and $100$, respectively. According to the National Air Quality Index $\text{...

Match the followingJ) Dalton's lawi) DiffusionK) Fick's lawii) Pressure exerted by a mixture of gasesL) Henry's lawiii) Gravitational settlingM) Stoke's lawiv) Gas-liquid...

Which of the following statements is/are NOT true?Urban heat island effect in a city can be reduced by increasing trees and vegetation cover in the city.Urban heat island...

A sample of air is collected in the morning at an ambient temperature of $\mathbf{2 5}{ }^{\circ} \mathbf{C}$. The concentration of carbon monoxide $\text{(CO)}$ in this ...

Which of the following is/are both greenhouse gas(es) and ozone depleting substance(s)?$\text{CFC-11}$$\mathrm{CO}_{2}$$\text{HCFC-22}$$\mathrm{N}_{2} \mathrm{O}$

In air pollution, which of the following is/are classified as primary pollutants?Carbon monoxide $(\mathrm{CO})$Sulphur dioxide $\left(\mathrm{SO}_{2}\right)$Ozone $\left...

Which one of the following is most commonly used raw material in flue gas desulfurization units?LimestoneTitanium OxideFenton reagentBeryllium Oxide

$\quad \mathrm{PM}_{2.5}$ concentrations in ambient air can be measured usingBeta attenuation methodChemiluminescence methodGravimetric methodNon dispersive infrared spec...

According to the National Ambient Air Quality Standards (Central Pollution Control Board, Govt. of India, notification 2009) which of the following statement(s) is/are co...