Section 24-143. Emission of air contaminant from internal or external combustion engine; visibility standard

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No person shall cause or  permit  the  emission of a visible air contaminant from the internal or external
  combustion engine of:
    (a) A motor vehicle while the vehicle is stationary  for  longer  than
  ten consecutive seconds; or
    (b) A motor vehicle after the vehicle has moved more than ninety yards
  from a place where the vehicle was stationary.

                    
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