N.Y. Comp. Codes R. & Regs. tit. 6, § 219-2.4 – Operating requirements.

(a) Combustion index.
1. (1) a combustion index of 99.9 percent based on a running eight-hour average of readings, and 99.95 percent, based on a running seven-day average of readings, must be maintained except as approved under paragraph (2) of this subdivision, or section 219-2.5 of this Subpart. The combustion index is determined by:
  CI =CO₂ × 100/(CO ₂ + CO)
  where
  CI = combustion index
  CO = carbon monoxide in the exhaust gas, parts per million by volume (dry)
  CO₂ = carbon dioxide in the exhaust gas, parts per million by volume (dry)
2. (2) on a case-by-case basis, alternative combustion index criteria may be established for any source subject to the requirements of this Subpart which is demonstrated to be unable to meet the combustion index criteria of paragraph (1) of this subdivision. Such alternative combustion index criteria will only be allowed in instances where the source is in compliance with the provisions of section 219-2.2 of this Subpart. In no case may such alternative combustion index criteria be less than 99.80 percent, based on a running eight-hour average of readings.
(b) It must be demonstrated by a method specific to the proposed facility and acceptable to the commissioner, that actual measurements indicate a temperature and residence time of at least 1,800°F for one second in the combustion zone on a continuous basis, or equivalent. The demonstration must be based on a continuous 30-minute average of temperature measurements.
(c) No person may cause or allow emissions to the outdoor atmosphere having a six-minute average opacity of 10 percent or greater from any emission point subject to these requirements.
(d) Auxiliary burners must be operated as necessary to comply with the requirements of subdivision (b) of this section at the following times:
1. (1) furnace startup prior to introduction of municipal solid waste;
2. (2) furnace shutdown when municipal solid waste feed has been discontinued until complete burnout in the furnace has occurred;
3. (3) when processing marginally combustible waste, during periods of malfunction, or any other time when the requirements of subdivision (b) of this section cannot otherwise be met, unless such operation is approved in accordance with section 219-2.5 of this Subpart; and
4. (4) at such other times as determined to be appropriate by the commissioner.
(e) Control equipment for reducing emissions of hydrogen chloride must be operated such that the flue gas temperature at the outlet from the control device does not exceed 300°F unless a demonstration is made that an equivalent collection of condensible heavy metals and toxic organics can be achieved at a higher outlet temperature or through the use of alternate technologies.