Engineering controls are the most protective means of controlling respirable coal mine dust David J Blackley, Cara N Halldin, A Scott Laney The Lancet Respiratory Medicine Volume 5, Issue 5, (May 2017) DOI: 10.1016/S2213-2600(17)30127-3 Copyright © 2017 Elsevier Ltd Terms and Conditions
Figure Prevalence of progressive massive fibrosis* in underground-working coal miners with 25 years or more of underground mining tenure—KY, VA, and WV, 1974–2015 *Data source: the Coal Workers' Health Surveillance Program.4 Surveillance is done on a 5-year national cycle. Data are 5-year moving averages, eg, data plotted for 1974: ∑ [ P M F 1970 + P M F 1971 + P M F 1972 + P M F 1973 + P M F 1974 ] ∑ P a r t i c i p a n t s 1970 - 74 Reproduced from Blackley and colleagues.3 The Lancet Respiratory Medicine 2017 5, DOI: (10.1016/S2213-2600(17)30127-3) Copyright © 2017 Elsevier Ltd Terms and Conditions