Emissions are gases released into the air by natural or man-made processes that produce electricity or other forms of energy. Emissions can be produced by heat, light or even by smell. Emissions that are produced by humans are largely responsible for air pollution, climate change, and the increasingly poor health of people around the world. Carbon dioxide, methane, nitrous oxide, halocarbons and sulfur hexafluoride are some greenhouse gases related to climate change, which are produced mainly by burning fossil fuels to create energy (Halderman Automotive 49).
Vehicles move by way of mechanical energy produced by the engine. In the combustion process and by fuel evaporation, a vehicle takes part in environmental pollution and the greenhouse effect, which ultimately causes global warming. When experts realized what these emissions can do to them and the environment, the government started to create laws to counteract these effects. In addition, vehicle manufacturers started to produce vehicles with parts that made less exhaust emissions. Carburetors, fuel injector, catalytic converters, oxygen sensors, power control module (PCM), and evaporative emissions system (EVAP) are some parts used in automobiles that help to lower the emissions.
Air and fuel are required to fire up an engine. .
The piston's movement is powered by the pressure made from the air and fuel mixture. In order to create this pressure, the engine only requires 10 milligrams of gasoline per one combustion stroke. A car uses a fuel mixture of 12:1 ratio of air and fuel under normal operations (Halderman Automotive 195). Sometimes the fuel/air mixture can be lean or rich. When the mixture is lean, the fuel ratio is considered lower than what is required. Rich mixtures have more fuel than the combustion process requires. .
With a rich fuel mixture, the car runs very smokily, or poorly. During any of these conditions, vehicle's emissions are considered high.
