Subpart 257-3: Air Quality Standards-Particulates
(Statutory Authority: Environmental Conservation Law, § 15)
[Filed 2/16/77. 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.
- 257-3.1 Definition
- 257-3.2 Objective
- 257-3.3 Standard for suspended particulates
- 257-3.4 Standard for settleable particulates (dustfall)
- 257-3.5 Measurement
- 257-3.6 Sampling frequency
Particulate is any matter dispersed in the atmosphere, whether solid or liquid, in which the individual particles are larger than single molecules (about 0.0002 µ in diameter), but smaller than about 500 µ. Settleable particulates, or dustfall, is normally in the size range greater than 10 µ, and suspended particulates range below 10 µ in diameter. For the purposes of this Subpart, the suspended and settleable particulates are as collected and measured by the method specified or other methods acceptable to the commissioner.
(a) For suspended particulates protection from adverse health effects, taking into consideration its synergistic effects.
(b) For settleable particulates to alleviate the nuisance of dustfall and to reduce the economic cost of air pollution.
§257-3.3 Standard for suspended particulates
(a) 24-hour standard. For any 24-hour period, the average concentration shall not exceed 250 µg/m3 more than once a year. (Applicable in all levels.)
(b) Annual standard. During any 12 consecutive months, the geometric mean of the 24-hour average concentrations shall not exceed:
|Level I||45 µg/m3||Level III||65 µg/m3|
|Level II||55 µg/m3||Level IV||75 µg/m3|
(c) 30-day standard. During any 30 consecutive days, the arithmetic mean of the 24-hour average concentrations, at any location, shall not exceed:
|Level I||80 µg/m3||Level III||115 µg/m3|
|Level II||100 µg/m3||Level IV||135 µg/m3|
(d) 60-day standard. During any 60 consecutive days, the arithmetic mean of the 24-hour average concentrations, at any location, shall not exceed:
|Level I||70 µg/m3||Level III||95 µg/m3|
|Level II||85 µg/m3||Level IV||115 µg/m3|
(e) 90-day standard. During any 90 consecutive days, the arithmetic mean of the 24-hour average concentrations, at any location, shall not exceed:
|Level I||65 µg/m3||Level III||90 µg/m3|
|Level II||80 µg/m3||Level IV||105 µg/m3|
(f) The standards in subdivisions (c), (d) and (e) of this section are intended for enforcement purposes, and monitoring will be performed only as required in a particular area. For prediction purposes, prediction of conformity with the annual geometric mean standard shall be sufficient to demonstrate predicted conformity with these standards.
§257-3.4 Standard for settleable particulates (dustfall)
(a) During any 12 consecutive months, 50 percent of the values of the 30 day average concentrations shall not exceed:
|Level I||0.30 mg/cm2/mo||Level III||0.40 mg/cm2/mo|
|Level II||0.30 mg/cm2/mo||Level IV||0.60 mg/cm2/mo|
(b) During any 12 consecutive months, 84 percent of the values of the 30-day average concentrations shall not exceed:
|Level I||0.45 mg/cm2/mo||Level III||0.60 mg/cm2/mo|
|Level II||0.45 mg/cm2/mo||Level IV||0.90 mg/cm2/mo|
(a) Concentration of suspended particulates is determined gravimetrically by the use of high-volume sampling techniques by drawing air through a filter for 24 hours and is expressed in micrograms of suspended particulate per cubic meter of air (µg/m3). Specifications for equipment and filter media shall conform to standards acceptable to the commissioner.
(b) Concentration of settleable particulates or dustfall is determined gravimetrically by the collection of the settleable particulate in a one-gallon glass jar without a lid. Area on which the particles have settled is computed from the inside diameter of the jar mouth. The results are expressed as milligrams of settleable particulate per square centimeter per month (mg/cm2/mo).
§257-3.6 Sampling frequency
(a) The following guidelines regarding minimum frequency of sampling shall be used to determine compliance with standards.
(b) Suspended particulate standards.
(1) Annual standard--every sixth day sampling-minimum of 50 samples.
(2) 24-hour standard--every sixth day sampling-minimum of 50 samples.
(3) 30-day standard--every day sampling-minimum of 24 samples.
(4) 60-day standard--every other day sampling-minimum of 24 samples.
(5) 90-day standard--every other day sampling-minimum of 36 samples.