There are millions of cars on the road in the United States, and each one is a source of air pollution. Especially in large cities, the amount of pollution that all the cars produce together can create big problems.
To solve those problems, cities, states and the federal government create clean-air laws that restrict the amount of pollution that cars can produce. Over the years, automakers have made many refinements to car engines and fuel systems to keep up with these laws. One of these changes came about in 1975 with an interesting device called a catalytic converter. The job of the catalytic converter is to convert harmful pollutants into less harmful emissions before they ever leave the car's¬ exhaust system.
Catalytic converters are amazingly simple devices, so it is incredible to see how big an impact they have. In this article, you will learn which pollutants are produced by an engine and how a catalytic converter deals with each of these pollutants to help reduce vehicle emissions.
You should post this question in the engineering section.
Source(s):senior Biology major at NIU, DeKalb,
IL
It is done at emission testing garages where I live in the US.
average vehical checked per month
It checks how much pollution in puts out
Check
None. It is not the purpose of a petrol pump to check vehicles.
combustion leading to environmental pollution is killing thousands of people everyday. there are many ways and meana to check pollution. 1. by keeping surveys. 2.
check
The safest and easiest way to check petrol purity is the filter paper test. Take a piece of filter paper and drop a small bit of petrol on it. If it evaporates in a short amount of time and doesn't leave a line or mark behind it is good quality.
check plugs and fuel pump
Depending on their orientation, and/or doping, they can be conducting or semi-conducting. Check the wikipedia article: http://en.wikipedia.org/wiki/Carbon_nanotube
Check if the results are valid
This is the determinaton of contamination in a specific area.
They have the emissions tested.