can u tell me about devices that control pollution?

Answer 1

Pollution control devices work in several different ways.

Catalytic converters: A catalyst enables a chemical reaction that changes a pollutant into a harmless or less harmful material. For instance a car's catalytic converter changes NOx (nitrogen oxides, which cause smog and some types of acid rain) into N2 and O2 (nitrogen and oxygen, both harmless).

Filters: Filters trap pollutants. A power plant will be equipped with scrubbers that capture particulates.

Chemical scrubbers: a chemical scrubber will mix power plant exhaust with a chemical that reacts with a pollutant to convert it to a less harmful substance. This is different than a catalytic converter because a chemical scrubber must be continuously supplied with the scrubbing chemical. A catalytic converter just encourages the chemical reaction of materials already in the exhaust stream without the need to add anything.

Fuel refining: When refining a fuel a material may be removed that if allowed to burn would create a pollutant. For instance Diesel fuel is refined to remove sulfur. Sulfur is the main contributor to acid rain and also it will contaminate a catalytic converter preventing it from working properly.

Additives: In some cases additives are added to fuels. They react in the burning process to reduce the formation of pollutants. For instance additives that contain oxygen in their molecule are added to gasoline. This can reduce the formation of certain pollutants when it is burned.

There are actually many other ways that pollution is controlled. A complete answer would require a book.

Answer 2

In the mufflers of cars is an item called a catalytic converter. It uses a mix of metals to attract pollutants in the exhaust, making what comes out of the tailpipe less harmful. Smokestacks have things called scrubbers, which do the same sort of thing.

Answer 3

Well if u consider CO2 as a pollution you are wrong,but the green plants will take care of it for you.

Answer 4

PCV reduces crankcase emissions
EGR reduces NoX emissions
Air pumps reduce HC emissions
computer controls and catalytic converters reduce emissions.