§ 60.6465 What continuous emission monitoring systems must I install for gaseous pollutants?
(a) You must install, calibrate, maintain, and operate continuous emission monitoring systems for oxygen (or carbon dioxide), sulfur dioxide, carbon monoxide, and nitrogen oxides to demonstrate compliance with the emission limits specified in Tables 2 and 3 to Subpart WWWW. Install the continuous emission monitoring systems for sulfur dioxide, nitrogen oxides, carbon monoxide, and oxygen (or carbon dioxide) at the outlet of the air pollution control device.
(b) If you elect to continuously monitor emissions for particulate matter, cadmium, lead, mercury, or hydrogen chloride in lieu of performance testing, you must install, calibrate, maintain, and operate continuous emissions monitoring systems for monitoring the particulate matter, cadmium, lead, mercury, or hydrogen chloride emissions discharged to the atmosphere and continuous emissions monitoring systems for oxygen (or carbon dioxide) at the outlet of the air pollution control device.
(c) You must install, evaluate, and operate each continuous emission monitoring system according to the “Monitoring Requirements” in § 60.13.
(d) You must monitor the oxygen (or carbon dioxide) concentration at each location where you monitor carbon monoxide, sulfur dioxide, and nitrogen oxides. If you elect to continuously monitor emissions for particulate matter, cadmium, lead, mercury, or hydrogen chloride, you must monitor the oxygen (or carbon dioxide) concentration at each location where you monitor particulate matter, cadmium, lead, mercury, or hydrogen chloride.
(e) You may choose to monitor carbon dioxide instead of oxygen as a diluent gas. If you choose to monitor carbon dioxide, then an oxygen monitor is not required and you must follow the requirements in § 60.6485.