; and (2) requiring the Federal Aviation Administration to conduct an investigation described in subsection (b) when the report indicates that 1 or more crew members or passengers had symptoms that required medical attention. (b) Requirements for investigations An investigation described in this subsection shall include the following: (1) Gathering factual and standardized information from all flight attendants, pilots, aircraft maintenance technicians, airport first responders, emergency response teams, and medical doctors involved in the incident. (2) Gathering any reports submitted under section 45403 with respect to the incident. (3) Gathering technical findings on any replaced, worn, missing, failed, or improperly serviced components that may have resulted in the incident. (4) Identifying the cause of the incident, if possible. (c) Participation of air carriers and collective bargaining representatives In conducting an investigation under this section, the Federal Aviation Administration shall— (1) consult with the air carrier involved; (2) work in conjunction with the technical representatives of the air carrier; and (3) invite the participation of the collective bargaining representative of employees of the air carrier. 45405. Air quality monitoring equipment (a) Requirement To include on aircraft Not later than 180 days after the date of the enactment of this section, the Administrator shall promulgate regulations requiring an air carrier, after 90 days for public comment and not later than 1 year after the regulations are finalized in the Federal Register— (1) to install and operate onboard detectors and other air quality monitoring equipment that— (A) are situated in the air supply system to enable pilots and maintenance technicians to identify the location of the source or sources of air supply contamination in real time, including any concentration of carbon monoxide that is dangerous to human health