Involves substances detected in 2017-2019 for which annual utility averages have been lower than an EWG-selected overall health guideline founded by a federal or state community health and fitness authority; chemicals detected beneath the EPA's Unregulated Contaminant Checking Rule (UCMR 3) program in 2013 to 2015 (and subsequent screening when https://air-quality-compliance-in26159.bloginwi.com/61880432/article-under-review