Search results
Results From The WOW.Com Content Network
Functions of CPCB comes under both national level and as State Boards for the Union Territories. CPCB, under the Water (Prevention and Control of Pollution) Act, 1974, and the Air (Prevention and Control of Pollution) Act, 1981, aims to promote cleanliness of streams and wells in different areas of the States by prevention, control and abatement of water pollution, and to improve the quality ...
Simulations can cover area ranging from very local (less than one kilometer) to regional (hundreds of kilometres) scales. Plume rise of hot emission from stack is taken into account using a Briggs formulation. Algorithms for particle-oriented dry/wet deposition processes and for considering the gravitational settling are present.
For example, such a regulation might limit the concentration of NOx to 55 ppmv in a dry combustion exhaust gas corrected to 3 volume percent O 2. As another example, a regulation might limit the concentration of particulate matter to 0.1 grain per standard cubic foot (i.e., scf) of dry exhaust gas corrected to 12 volume percent CO 2.
Air pollution emission source. Types of air pollutant emission sources – named for their characteristics Sources, by shape – there are four basic shapes which an emission source may have. They are: Point source – single, identifiable source of air pollutant emissions (for example, the emissions from a combustion furnace flue gas stack ...
The United States also limits the maximum height of a flue gas stack to what is known as the "Good Engineering Practice" (GEP) stack height. [8] [9] In the case of existing flue gas stacks that exceed the GEP stack height, any air pollution dispersion modelling studies for such stacks must use the GEP stack height rather than the actual stack ...
The city should set limits on emissions from certain buildings, using an approach already in place in New York, according to the report from the Urban Land Institute Chicago.
Regulations that define and limit the concentration of pollutants in the ambient air or in gaseous emissions to the ambient air are issued by various national and state (or provincial) environmental protection and occupational health and safety agencies. Such regulations involve a number of different expressions of concentration.
An emission performance standard is a limit that sets thresholds above which a different type of vehicle emissions control technology might be needed. While emission performance standards have been used to dictate limits for conventional pollutants such as oxides of nitrogen and oxides of sulphur (NO x and SO x ), [ 3 ] this regulatory ...