Recent activity in Air and Noise Pollution

The concentration of chemical $\text{A}$ in ambient air is $50 ~\mu \mathrm{~g} / \mathrm{m}^{3}$ and the toxicological index limit for a threshold health effect for this...

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{...

The sound level measured at various locations in an urban area is given in the table.The average sound level for that area is $\_\_\_\_$ dBA (rounded off to two decimal p...

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...

Which ONE of the following options CORRECTLY matches the atmospheric stability conditions with plume conditions/ behaviours given in the table?$$\begin{array}{|l|l|}\hlin...

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

In the design of air pollution control devices, size of the particles that are removed with $50 \%$ efficiency is termed as $\_\_\_\_$.mean sizemode sizecut sizemedian si...

An incandescent light bulb operated for two hours per day uses $12.2 \: \text{kWh}$ of energy per month. Burning of one kg of coal generates $2 \: \text{kWh}$ of electric...

A particle dispersoid has $1510$ spherical particles of uniform density. An air purifier is proposed to be used to remove these particles. The diameter specific number of...

​​​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...

​​Consider the following statementsSound pressure changes with distance from the sourceSound power is a property of the sourceSound intensity is sound power per unit volu...

​​​​​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...

​​​​​Consider the following statements$P$: According to the National Ambient Air Quality Standards (Central Pollution Control Board, Govt. of India, notification $2009$),...

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

A gravity settling chamber of height ' $H$ ' and length ' $L$ ' is designed to control particulate air pollution. In the chamber, the horizontal velocity of air flow is '...

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

Two sources of noise, adjacent to each other in a room, have sound pressure levels of $30$ and $40$ decibel $\text{(dB)}$. The combined sound pressure level in the room i...

Which of the following is true according to the Central Pollution Control Board $\text{(CPCB)}$, Government of India's notification issued in the year $2009$?$24$ hour av...

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{...