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The EGR system routes many of the exhaust gases (6 ? 10%) through the EGR valve, last on the Intake System, and in the end in the combustion chamber. The exhaust gases are inert i.e. they don't burn within the combustion chamber; also, the exhaust gases use up a number of the space which could preferably be taken with the intake air. This decreases the volume of intake air available for the combustion process during each Power Stroke; which experts claim decreases the peak combustion temperatures. This leads to lower NOx emissions. Anxiety disorder treatment is typically in the form of psychotherapy and is sometimes combined with medication. Anxiety disorders often occur with other disorders such a substance use disorder, so anxiety disorder treatment often includes the treatment for those disorders as well. Education about mental illness, anxiety disorders in particular, and lifestyle changes are often crucial to the success of anxiety disorder treatment. Generalized anxiety disorder (GAD)