Visible emissions (opacity) limit

(a) Opacity limit. No person shall allow the discharge of any fumes, aerosol, mist, gas, smoke, vapor, particulate matter or any combination thereof exhibiting greater than 20% opacity. This requirement shall not apply to visible emissions exhibiting greater than 20% opacity emitted during short-term occurrences, which consist of not more than one six-minute period in any consecutive 60 minutes, not to exceed three such periods in any consecutive 24 hours, during which the average of any six-minute period shall not exceed 60% opacity. (b) Alternate opacity limit. The 20% opacity limit required under 252:100-24-4 (a) may be increased for particulates only provided that the owner or operator demonstrates to the satisfaction of the Air Quality Advisory Council at public hearing that those requirements listed in 252:100-25-4 (a) through (c) have been met. 15 (c) Exceptions. Exceptions to the 20% opacity limit described in 252:100-24-4 (a) are provided as follows: (1) Visible emissions from loading-out (shipping) shall be no more than sixty-five percent (65%) opacity, and visible emissions from unloading (receiving) shall be no more than fifty-five percent (55%) opacity. (2) Emissions from pressurized vents or openings without control devices shall either be enclosed, exhausted through a control device, or shall be limited to no greater than ten percent (10%) opacity. (3) Emissions from non-pressurized vents or openings without control devices shall be limited to no greater than 10% opacity.