(8) (a) "Lead-contaminated dust" shall mean dust containing lead at a mass per area concentration of 10 or more micrograms per square foot on a floor, 50 or more micrograms per square foot on window sills, and 100 or more micrograms per square foot on window wells, or such more stringent standards as may be adopted by rule of the department of health and mental hygiene, provided that, if the federal environmental protection agency or a successor agency, or the federal department of housing and urban development or a successor agency, adopts lower definitions of lead-contaminated dust, the board of health shall define in the health code such lower levels for the purposes of this subchapter.
(b) Notwithstanding subdivision (a) of this section, on and after June 1, 2021, "lead-contaminated dust" shall mean dust containing lead at a mass per area concentration of 5 or more micrograms per square foot on a floor, 40 or more micrograms per square foot on window sills, and 100 or more micrograms per square foot on window wells, or such more stringent standards as may be adopted by the board of health, provided that, if the federal environmental protection agency or a successor agency, or the federal department of housing and urban development or a successor agency, adopts lower definitions of lead-contaminated dust, the board of health shall define in the health code such lower levels for the purposes of this subchapter.
(9) "Lead-contaminated dust clearance test" shall mean a test for lead-contaminated dust on floors, window wells, and window sills in a dwelling, that is made in accordance with section 27-2056.11 of this article.