Code of Federal Regulations > Title 40 > Chapter I > Part 60 > Subpart WWWW > Appendix - Table 2 to Subpart WWWW—Municipal Waste Combustor Carbon Monoxide Guidelines

Regulations last checked for updates: May 30, 2026

Title 40 - Protection of Environment last revised: Aug 30, 2026

Appendix - Table 2 to Subpart WWWW—Municipal Waste Combustor Carbon Monoxide Guidelines

[Parts per million by volume]

Municipal waste combustor technology	The following emission limits and averaging times apply . . .
Municipal waste combustor technology	Carbon monoxide emission limit (parts per million by volume) ^a	Averaging time (hours) ^b
Mass burn waterwall	100	4
Mass burn refractory	100	4
Mass burn rotary refractory	110	24
Mass burn rotary waterwall	110	24
Modular starved air	50	4
Modular excess air	50	4
Refuse-derived fuel stoker	110	24
Fluidized bed, mixed fuel (wood/refuse-derived fuel)	110	24
Bubbling fluidized bed combustor	100	4
Circulating fluidized bed combustor	100	4
Pulverized coal/refuse-derived fuel mixed fuel-fired combustor	110	4
Spreader stoker coal/refuse-derived fuel mixed fuel-fired combustor	110	24
Semi-suspension refuse-derived fuel-fired combustor/wet refuse-derived fuel process conversion	250	^c 24
Spreader stoker fixed floor refuse-derived fuel-fired combustor/100 percent coal capable	250	^c24

^a Measured at the combustor outlet in conjunction with a measurement of oxygen concentration, corrected to 7 percent oxygen (dry basis). Calculated as an arithmetic average. CEMS data during warmup, startup, and shutdown, as defined in this subpart, are not corrected to 7 percent oxygen, and are used as measured. The averaging times are specified in greater detail in § 60.6495(b).

^b Averaging times are 4-hour or 24-hour block arithmetic averages.

^c 24-hour block average, geometric mean.

authority: 42 U.S.C. 7401

source: 36 FR 24877, Dec. 23, 1971, unless otherwise noted.