{"data":{"id":"us/40-cfr-60.4209","jurisdiction":"us","citation":"40 CFR 60.4209","heading":"What are the monitoring requirements if I am an owner or operator of a stationary CI internal combustion engine?","body":"If you are an owner or operator, you must meet the monitoring requirements of this section. In addition, you must also meet the monitoring requirements specified in § 60.4211.\n(a) If you are an owner or operator of an emergency stationary CI internal combustion engine that does not meet the standards applicable to non-emergency engines, you must install a non-resettable hour meter prior to startup of the engine.\n(b) If you are an owner or operator of a stationary CI internal combustion engine equipped with a diesel particulate filter to comply with the emission standards in § 60.4204, the diesel particulate filter must be installed with a backpressure monitor that notifies the owner or operator when the high backpressure limit of the engine is approached.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 60—STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES","Subpart IIII—Standards of Performance for Stationary Compression Ignition Internal Combustion Engines"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"3ef9bc4011fb3376f1bf7175e5ceb8694b00e4f9f7cc37d5a895935ffc2e82fb","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-60.4208","next":"us/40-cfr-60.4210"},"notice":"GroundRules: Original legal text. Not legal advice."}