Subpart 257-2: Air Quality Standards-Sulfur Dioxide (So2)
(Statutory Authority: Environmental Conservation Law, § 15)
[Filed 8/9/77. Effective 30 days after filing.]
[This is page 1 of 1 of this Subpart. A complete list of Subparts in this regulation appears in the Chapter 3 contents page. A list of sections in this Subpart appears below.]
For administrative information about this posting, contact: Division of Air Resources. The Bureau of Air Quality Planning at (518) 402-8396 or the Bureau of Stationary Sources at (518) 402-8403 is the contact for technical questions pertaining to this rule.
(a) Sulfur dioxide (SO2). A nonflammable, nonexplosive, colorless gas, having a pungent, irritating odor. For the purpose of this Subpart, this term shall also include other material that may test as sulfur dioxide by the specified method of measurement.
(b) Ppm. Parts of contaminant per million parts of air by volume.
(c) µg/m3. Micrograms of contaminant per cubic meter of air.
Sulfur dioxide has been associated with increase in chronic respiratory disease on long term exposures and alteration in lung and other physiological functions on short term exposures. Although plant damage to sensitive vegetation and significant metal corrosion and other effects may occur at other ambient air concentrations, the primary objective of these standards is to prevent adverse health effects.
§257-2.3 Standards (SO2)
(a) During any 12 consecutive months, 99 percent1 of the three-hour average concentrations shall not exceed 0.25 ppm and the three-hour average concentration shall not exceed 0.50 ppm2 more than once a year. (Applicable in all levels).
(b) During any 12 consecutive months, 99 percent3 of the 24-hour average concentrations shall not exceed 0.10 ppm; and the 24-hour average concentration shall not exceed 0.14 ppm4 more than once a year. (Applicable in all levels).
(c) During any 12 consecutive months, the annual average of the 24-hour average concentrations shall not exceed 0.03 ppm5. (Applicable in all levels).
- 1For predicting future concentrations, predicted conformity with the 0.50 standard will be sufficient to demonstrate prediction of conformity with the 99 percent standard.
- 2Corresponds to Federal standard of 1300 µg/m3 (at temperature of 25oC and pressure of 760 mm or mercury).
- 3For predicting future concentrations, predicted conformity with the 0.14 standard will be sufficient to demonstrate prediction of conformity with the 99 percent standard.
- 4Corresponds to Federal standard of 365 µg/m3 (at temperature of 25oC and pressure of 760 mm of mercury).
- 5Corresponds to Federal standard of 80 µg/m3 (at temperature of 25oC and pressure of 760 mm of mercury).
(a) Sulfur dioxide in air is determined by the West Gaeke method of analysis, or by other methods acceptable to the commissioner.
(b) All measurements are corrected to a reference temperature of 25 degrees Centigrade and to a reference pressure of 760 millimeters of mercury.