The exhaust smoke that comes out of cars is not only bad for the environment but also injurious to the health of animals and human beings. America is one of those countries where car gas emissions are considered to be a major threat to human health as well as the environment and the Government has laid out laws that require vehicles to be checked every two years for emissions control. This piece looks at what’s being done on individual level by Americans and a local car mechanic tells his …

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