; or (B) to protect the public health. (e) Precautionary approach In promulgating the corrective action level for each of the hazardous air pollutants described in subsection (a)(3), the Administrator shall take a precautionary approach to ensure that, if the monitored concentration at the fenceline hits a level that has potential to cause any person to experience impaired quality of life, become ill, or die from cancer or any other chronic or acute health impairment related to short- or long-term air pollution exposure (including any fetal exposure that begins in utero), that the facility must reduce its emissions to prevent such harm. (f) Authorization of appropriations There is authorized to be appropriated to carry out this section $17,500,000 for fiscal year 2021. 4. Criteria pollutant/NAAQS monitoring network (a) Deployment of NCore multipollutant monitoring stations The Administrator shall require the deployment of an additional 80 NCore multipollutant monitoring stations. (b) Deadline Not later than 12 months after the date of enactment of this Act, the Administrator shall ensure all NCore multipollutant monitoring stations required to be deployed under subsection (a) are installed and integrated into the air quality monitoring system established pursuant to section 319 of the Clean Air Act ( 42 U.S.C. 7619 ). (c) Monitoring results Monitoring results from NCore multipollutant stations deployed pursuant to subsection (a) shall be used for purposes of comparison to national ambient air quality standards, and for such other purposes as the Administrator determines will promote the protection of public health from air pollution. (d) Locations (1) Vulnerable populations (A) Census tracts The Administrator shall ensure that at least 40 of the NCore multipollutant monitoring stations required under subsection (a) are sited in census tracts that each meet one or more of the following criteria: (i) The rates of childhood asthma, adult asthma, chronic obstructive pulmonary disease, heart disease, or cancer are