To reduce smog, Congress passed the Clean Air Act (CAA) in 1970. This established max allowable emission levels of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOX) on new vehicles. This section focuses on:
To reduce smog, Congress passed the Clean Air Act (CAA) in 1970. This established max allowable emission levels of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOX) on new vehicles. This section focuses on:
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