div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=background-equivalent-concentrationhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Background Equivalent Concentration loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentsusreader034viewer20220522065449f643b1af9f45568b4610html5thumbnails1jpg width=140 height=200 divpTHIS MATERIAL MAY BE PROTECTED BY COPYRIGHT LAW TITLE 17 US CODEpdivdiv class=ts-pagebutton class=gotoPage data-page=2Page 2button div class=ts-imageimg data-url=background-equivalent-concentrationhtmlpage=2 data-page=2 class=ts-thumb lazyload alt=Page 2: Background Equivalent Concentration loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentsusreader034viewer20220522065449f643b1af9f45568b4610html5thumbnails2jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imageimg data-url=background-equivalent-concentrationhtmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: Background Equivalent Concentration loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentsusreader034viewer20220522065449f643b1af9f45568b4610html5thumbnails3jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 4button div class=ts-imageimg data-url=background-equivalent-concentrationhtmlpage=4 data-page=4 class=ts-thumb lazyload alt=Page 4: Background Equivalent Concentration loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentsusreader034viewer20220522065449f643b1af9f45568b4610html5thumbnails4jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=5Page 5button div class=ts-imageimg data-url=background-equivalent-concentrationhtmlpage=5 data-page=5 class=ts-thumb lazyload alt=Page 5: Background Equivalent Concentration loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentsusreader034viewer20220522065449f643b1af9f45568b4610html5thumbnails5jpg width=140 height=200 divdiv