No person shall cause, let, permit, suffer, or allow any emission or sulfur oxides which results in ground level concentrations of sulfur oxides at any given point in excess of five-tenths parts per million by volume in the period of any hour, and average exposure shall not exceed one-tenth parts per million by volume of sulfur oxide in any 24-hour period. These limitations shall not apply to ground level concentrations occurring on the property from which the emission occurs; provided that the property, from the emission point to the point of any concentration, is controlled by the person responsible for the emission.
(Prior Code, § 102.150)