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Q:what does an EGR valve do?
A:When combustion temperatures exceed 2500 degree F., atmospheric nitrogen begins to react with oxygen during combustion. This result in formation of various compounds called nitrogen oxides (NOX), which play a major role in urban air pollution. To reduce the formation of NOX, combustion temperatures must be kept below the NOX threshold. This is done by recirculating a small amount of exhaust through the "exhaust gas recirculation," or EGR. valve.