06- 096 C.M.R. ch. 110, § 8

Current through 2024-51, December 18, 2024

Section 096-110-8 - Establishment of Ambient Increments

A. In addition to the ambient air quality standards adopted by the Board and enacted as 38 M.R.S.A.,584-A, any Class I Region or part thereof within the State (including those federal lands designated by the Clean Air Act Amendments of 1977 shall be subject to a maximum allowable increase in concentration of PM_2.5, PM₁₀, sulfur dioxide, and nitrogen dioxide over the baseline concentration of such pollutants. The maximum allowable increase for any period other than an annual period, shall not be exceeded more than once annually. Such maximum allowable increase shall consist of:

(1)PM _2.5

(a) An increase in the annual arithmetic mean at any location shall not exceed 1 microgram per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 2 micrograms per cubic meter.

(2)PM₁₀

(a) An increase in the annual arithmetic mean at any location shall not exceed 4 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 8 micrograms per cubic meter.

(3)Sulfur Dioxide

(a) An increase in the annual arithmetic mean at any location shall not exceed 2 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 5 micrograms per cubic meter.

(c) An increase in concentration for any three-hour period at any location shall not exceed 25 micrograms per cubic meter.

(4)Nitrogen Dioxide

(a) An increase in the annual arithmetic mean at any location shall not exceed 2.5 micrograms per cubic meter.

B. In addition to the ambient air quality standards adopted by the Board and enacted as 38 M.R.S.A., 584-A, any Class II region or part thereof within the State shall be subject to a maximum allowable increase in concentration of PM_2.5,PM₁₀, sulfur dioxide and nitrogen dioxide over the baseline concentration of such pollutants. The maximum allowable increase for any period other than an annual period, shall not be exceeded more than once annually. Such maximum allowable increase shall consist of:

(1)PM _2.5

(a) An increase in the annual arithmetic mean at any location shall not exceed 4 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 9 micrograms per cubic meter.

(2)PM₁₀

(a) An increase in the annual arithmetic mean at any location shall not exceed 17 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 30 micrograms per cubic meter.

(3)Sulfur dioxide

(a) An increase in the annual arithmetic mean at any location shall not exceed 20 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 91 micrograms per cubic meter.

(c) An increase in concentration for any three-hour period at any location shall not exceed 512 micrograms per cubic meter.

(4)Nitrogen Dioxide

(a) An increase in the annual arithmetic mean at any location shall not exceed 25 micrograms per cubic meter.

C. In addition to the ambient air quality standards adopted by the Board and enacted as 38 M.R.S.A., 584-A, any Class III Region or part thereof within the State shall be subject to a maximum allowable increase in concentration of PM_2.5, PM₁₀, sulfur dioxide and nitrogen dioxide over the baseline concentration of such pollutants. The maximum allowable increase for any period other than an annual period, shall not be exceeded more than once annually. Such maximum allowable increase shall consist of:

(1)PM _2.5

(a) An increase in the annual arithmetic mean at any location shall not exceed 8 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 18 micrograms per cubic meter.

(2)PM₁₀

(a) An increase in the annual arithmetic mean at any location shall not exceed 34 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 60 micrograms per cubic meter.

(3)Sulfur dioxide

(a) An increase in the annual arithmetic mean at any location shall not exceed 40 micrograms per cubic meter.

(b) An increase in concentration for any 24-hour period at any location shall not exceed 182 micrograms per cubic meter.

(c) An increase in concentration for any three-hour period at any location shall not exceed 700 micrograms per cubic meter.

(4)Nitrogen Dioxide

(a) An increase in the annual arithmetic mean at any location shall not exceed 50 micrograms per cubic meter.

06- 096 C.M.R. ch. 110, § 8