---
kind: "section"
citation: "40 C.F.R. § 76.6"
title: "40"
number: "76.6"
heading: "NO X emission limitations for Group 2 boilers."
url: "https://uscodex.org/cfr/40/76.6"
---

# §76.6. NO X emission limitations for Group 2 boilers.

- (a) Beginning January 1, 2000 or, for a unit subject to section 409(b) of the Act, the date on which the unit is required to meet Acid Rain emission reduction requirements for SO2, the owner or operator of a Group 2, coal-fired boiler with a cell burner boiler, cyclone boiler, a wet bottom boiler, or a vertically fired boiler shall not discharge, or allow to be discharged, emissions of NOX to the atmosphere in excess of the following limits, except as provided in §§ [76.10](/cfr/40/76.10.md) or [76.11](/cfr/40/76.11.md):
  - (1) 0.68 lb/mmBtu of heat input on an annual average basis for cell burner boilers. The NOX emission control technology on which the emission limitation is based is plug-in combustion controls or non-plug-in combustion controls. Except as provided in [§ 76.5(d)](/cfr/40/76.5.md?p=d), the owner or operator of a unit with a cell burner boiler that installs non-plug-in combustion controls shall comply with the emission limitation applicable to cell burner boilers.
  - (2) 0.86 lb/mmBtu of heat input on an annual average basis for cyclone boilers with a Maximum Continuous Steam Flow at 100% of Load of greater than 1060, in thousands of lb/hr. The NOX emission control technology on which the emission limitation is based is natural gas reburning or selective catalytic reduction.
  - (3) 0.84 lb/mmBtu of heat input on an annual average basis for wet bottom boilers, with a Maximum Continuous Steam Flow at 100% of Load of greater than 450, in thousands of lb/hr. The NOX emission control technology on which the emission limitation is based is natural gas reburning or selective catalytic reduction.
  - (4) 0.80 lb/mmBtu of heat input on an annual average basis for vertically fired boilers. The NOX emission control technology on which the emission limitation is based is combustion controls.
- (b) The owner or operator shall determine the annual average NOX emission rate, in lb/mmBtu, using the methods and procedures specified in [part 75](/cfr/40/part75.md) of this chapter.

## Notes

### Amendments

[62 FR 67162, Dec. 19, 1996; 62 FR 3464, Jan. 23, 1997; 62 FR 32040, June 12, 1997; 64 FR 55838, Oct. 15, 1999]

### Authority

Authority: 42 U.S.C. 7601 and 7651 et seq.

### Source

Source: 60 FR 18761, Apr. 13, 1995, unless otherwise noted.

### Amendments

[62 FR 67162, Dec. 19, 1996; 62 FR 3464, Jan. 23, 1997; 62 FR 32040, June 12, 1997; 64 FR 55838, Oct. 15, 1999]