text: For this analysis , the baseline scenarios for 2010 and 2020 assume no additional emissions control regulation beyond the continuing effects of Title IV of the Clean Air Act Amendments , the NOx SIP Call , and other promulgated federal rules issued under the Clean Air Act .
  
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  The baseline scenarios for 2010 and 2020 assume no extensive emissions control regulations , but do not account for the NOx SIP Call and other rules that affect car emissions .