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CHAPTER Env-A 2300 MITIGATION OF REGIONAL HAZE 

PART Env-A 2301 PURPOSE 

Env-A 2301.01 Purpose. This chapter establishes emission standards for certain fossil-fuel-fired 

steam generating units for the purpose of reducing emissions that contribute to regional haze. These 

limitations are necessary to ensure compliance with section 169A of the Act (42 U.S.C. 7491) and regional 

haze program requirements established at 40 CFR 51.308, including, but not limited to, provisions for Best 

Available Retrofit Technology (BART) [40 CFR 51.308(e)]. 

PART Env-A 2302 APPLICABILITY 

Env-A 2302.01 Applicability. This chapter shall apply to any fossil-fuel-fired steam generating 

unit of the following types whose maximum heat input rate is more than 1,000 million BTUs per hour: 

 (a) Cyclone-firing, wet-bottom boilers fueled by coal or any combination of fuels using coal; and 

 (b) Tangential-firing, dry-bottom boilers fueled by oil, gas, liquid biofuel, or any combination of 

oil, gas, and liquid biofuel. 

PART Env-A 2303 DEFINITIONS 

Env-A 2303.01 “Best Available Retrofit Technology (BART)” means an emission limitation based 

on the degree of reduction achievable through the application of the best system of continuous emission 

reduction for each pollutant which is emitted by an existing stationary facility, as defined in 40 CFR

51.301. The emission limitation must be established, on a case-by-case basis, taking into consideration the 

technology available, the costs of compliance, the energy and nonair quality environmental impacts of 

compliance, any pollution control equipment in use or in existence at the source, the remaining useful life 

of the source, and the degree of improvement in visibility which may reasonably be anticipated to result 

from the use of such technology.

Env-A 2303.02 "Coal" means coal as defined in Env-A 1211.02. 

Env-A 2303.03 "Gas" means gas or gaseous fuel as defined in Env-A 1211.02. 

Env-A 2303.04 “Liquid biofuel” means any liquid fuel such as biodiesel or cellulosic ethanol that 

is derived from renewable biological raw materials such as plants or food waste. 

Env-A 2303.05 "Maximum heat input rate" means maximum heat input rate as defined in Env-A 

1211.02. 

 Env-A 2303.06 “Oil” means any petroleum-based liquid fuel oil, including distillate and residual 

fuel oils. 

Env-A 2303.07 “Regional haze” means any humanly perceptible degradation in visibility from that 

which would have existed under natural conditions, caused by the presence of fine-particle air pollutants 

and their precursors originating from many sources over a wide geographic area. 

Env-A 2303.08 “Stack test” means the sampling, analysis, and reporting of emissions from a 

stationary point source in accordance with testing procedures specified in Env-A 802. 
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Env-A 2303.09 “Total suspended particulate matter (TSP)” means particulate matter as measured 

by the high-volume method described in Appendix B of 40 CFR Part 50. 

PART Env-A 2304 PERFORMANCE TESTING 

Env-A 2304.01 Performance Testing Requirements Applicable to Tangential-Firing, Dry-Bottom 

Boilers. For any tangential-firing, dry-bottom boiler subject to this chapter, performance tests shall be 

conducted as follows: 

(a) Performance testing for sulfur dioxide (SO2) emissions, nitrogen oxide (NOx) emissions, and 

total suspended particulate matter (TSP) emissions shall meet the requirements established by 

valid permit in accordance with Env-A 600; and 

(b) Any stack test required under this part shall be conducted in accordance with the requirements 

of Env-A 802. 

Env-A 2304.02 Performance Testing Requirements Applicable to Cyclone-Firing, Wet-Bottom 

Boilers. For any cyclone-firing, wet-bottom boiler subject to this chapter, performance tests shall be 

conducted as follows: 

(a) Performance testing for sulfur dioxide (SO2) emissions and nitrogen oxide (NOx) emissions 

shall meet the requirements established by valid permit in accordance with Env-A 600; 

(b) Periodic stack tests for total suspended particulate matter (TSP) emissions shall be conducted 

in accordance with the following protocol: 

(1) For an initial period of three years, stack tests shall be conducted annually, with the first 

stack test to be completed by June 30, 2013; 

(2) Beginning on July 1, 2015, stack tests shall be conducted every other year, with the fourth 

stack test to be completed by June 30, 2017. 

(3) At facilities where an affected unit shares a common stack with a second affected unit, the 

stack emissions shall be tested as from one source, by either of the following methods: 

a. With both units operating simultaneously, a stack test on the combined emissions from 

both units, or 

b. With one unit operating at a time, separate stack tests on the emissions from each unit; 

and 

(c) All stack tests shall be conducted in accordance with the requirements of Env-A 802. 

PART Env-A 2305 EMISSION STANDARDS FOR MITIGATION OF REGIONAL HAZE 

Env-A 2305.01 Emission Standards Applicable to Tangential-Firing, Dry-Bottom Boilers. For any 

tangential-firing, dry-bottom boiler subject to this chapter, the following emission rates shall apply: 

(a) Beginning on July 1, 2013, sulfur dioxide (SO2) emissions shall not exceed 0.50 lb per million 

BTUs on a calendar monthly average basis as recorded by a continuous emissions monitoring system 

(CEMS) in accordance with Env-A 2306; 
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(b) Nitrogen oxide (NOx) emissions shall not exceed limitations established by valid permit in 

accordance with Env-A 600; and 

(c) Total suspended particulate matter (TSP) emissions shall not exceed limitations established by 

valid permit in accordance with Env-A 600. 

Env-A 2305.02 Emission Standards Applicable to Cyclone-Firing, Wet-Bottom Boilers. 

(a) For any cyclone-firing, wet-bottom boiler subject to this chapter whose maximum heat input 

rate is less than or equal to 3,000 million BTUs per hour, the following emission rates shall apply: 

(1) Sulfur dioxide (SO2) emissions shall not exceed limitations established by valid permit in 

accordance with Env-A 600; 

(2) Nitrogen oxide (NOx) emissions shall not exceed limitations established by valid permit in 

accordance with Env-A 600; and 

(3) Beginning on July 1, 2013, TSP emissions shall not exceed 0.08 lb per million BTUs. 

Compliance with this standard shall be demonstrated by completion of periodic stack tests 

on the outlet side of the final emission control device, in accordance with Env-A 

2304.02(b). 

(b) For any cyclone-firing, wet-bottom boiler subject to this chapter whose maximum heat input 

rate is greater than 3,000 million BTUs per hour, the following emission rates shall apply: 

(1) Sulfur dioxide (SO2) emissions shall not exceed limitations established by valid permit in 

accordance with Env-A 600. 

(2) Beginning on July 1, 2013, nitrogen oxide (NOx) emissions shall not exceed 0.37 lb per 

million BTUs on a calendar monthly average basis as recorded by a CEMS in accordance 

with Env-A 2306; and 

(3) Beginning on July 1, 2013, TSP emissions shall not exceed 0.08 lb per million BTUs; 

Compliance with this standard shall be demonstrated by completion of periodic stack tests 

on the outlet side of the final emission control device, in accordance with Env-A 

2304.02(b). 

PART Env-A 2306 CONTINUOUS EMISSIONS MONITORING SYSTEMS 

Env-A 2306.01 Requirements for Continuous Emissions Monitoring Systems. The owner or 

operator of a source whose emissions are required to be monitored and recorded by a CEMS as provided in 

Env-A 2305.01 or Env-A 2305.02 shall: 

(a) Install, calibrate, operate, maintain, and perform quality assurance testing of the CEMS in 

accordance with the requirements of Env-A 808; and 

(b) Comply with recordkeeping requirements for CEMS as specified in Env-A 903.04.