Includes chemical substances detected in 2017-2019 for which once-a-year utility averages were reduced than an EWG-chosen health guideline set up by a federal or state community health and fitness authority; chemical substances detected under the EPA's Unregulated Contaminant Checking Rule (UCMR 3) system in 2013 to 2015 (and subsequent tests https://ca83726.blogdun.com/28629426/the-smart-trick-of-local-air-quality-in-irvine-that-no-one-is-discussing