[1987 Revision]
No person shall cause, suffer, allow or permit particles to be emitted from any stack or chimney into the outdoor air, the shade or appearance of which is greater than 20% opacity, exclusive of water vapor.
[1987 Revision]
The provisions of this section shall not apply:
a. 
To particles, the shade or appearance of which is greater than 20% opacity, exclusive of water vapor, for a period of not longer than three minutes in any consecutive thirty-minute period.
b. 
To source operations issued a variance by the New Jersey Department of Environmental Protection in accordance with Subchapter 6.5 of the New Jersey Administrative Code, as amended and supplemented.
c. 
To indirect heat exchangers.
d. 
To incinerators.
e. 
For a period of five years from the date of issuance of a valid permanent certificate to operate to a source operation equipped with control apparatus for which a valid permit to construct or the permanent certificate to operate was issued by the New Jersey Department of Environmental Protection during the period of June 15, 1967, to March 27, 1972.