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The Exhaust Gas Recirculation (EGR) valve plays a crucial role in reducing harmful emissions in internal combustion engines. Essentially, it recirculates a portion of exhaust gases back into the engine's intake manifold. By reintroducing inert exhaust gases, the what does a egr valve do lowers combustion temperatures, which helps reduce the formation of nitrogen oxides (NOx), a major contributor to smog and air pollution. This process also aids in preventing engine knocking and improving fuel efficiency. In summary, the EGR valve contributes significantly to environmental protection and engine performance by regulating the combustion process and minimizing harmful emissions.