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Abbreviations CI: Confidence interval CNKI: China National Knowledge Infrastructure EMP: Elongated mineral particle FDA: Food and Drug Administration IARC: International Agency for Research on Cancer mppcf: Million particles per cubic foot NIOSH: National Institute for Occupational Safety and Health NOS: Newcastle-Ottawa Scale NTP: National Toxicology Program PMR: Proportionate mortality ratio SIR: Standardized incidence ratio SMR: Standardized mortality ratio WHO: World Health Organization.
([paragraph]) (10 mg/[m.sup.3]) / (% quartz) and direct control of crystalline silica as respirable quartz in metal/non-metal mining using the formulas: (10 mg/[m.sup.3]) / (% quartz + 2) for general industry or (250 mppcf) / (% quartz + 5) for the construction industry.