title: [Analysis on occupational exposure levels and control effectiveness of dust in cement production line of new dry method].
abstract: OBJECTIVE
  To investigate the occupational exposure levels of dust in new suspension preheated dry process (NSP) cement production line and put forward rectification measures for dust-exposed posts, and to provide ideas for the modern cement production enterprises in dust control and occupational health management.
  
  
  METHODS
  Occupational health field investigation combined with field test were used to measure the time-weighted average concentration (C(TWA)) of the dust in the workplace. Rectification measures were taken for the dust-exposed posts with unqualified dust concentration, and the protective effects of dustproof facilities in the rectified workplace were evaluated.
  
  
  RESULTS
  The field investigation revealed incompletely closed dustproof facilities, improperly set dust hoods, excess of dust leakage points, and other problems in the dust-exposed posts of an NSP cement production line before rectification, and the dustproof facilities could hardly exert dust removal effect. The field test showed that the vast majority of dust-exposed posts had the dust concentrations exceeding the occupational exposure limits (OELs), with a qualified rate as low as 31.8%. A series of rectification measures were taken for these posts. After the rectification, the dust-exposed posts demonstrated dramatically dropped C(TWA), and the qualified rate of dust concentration in the dust-exposed posts rose to 90.9%.
  
  
  CONCLUSIONS
  The dust hazards in NSP cement production line cannot be ignored. Taking appropriate protective measures are critical for curbing dust hazards in modern cement production.
authors.affiliation: Shandong Center for Disease Control and Prevention, Jinan 250014, China.
authors.forename: De-jun
authors.initials: DJ
authors.lastname: Wang
authors.forename: Shao-feng
authors.initials: SF
authors.lastname: Sui
authors.forename: Fan-ling
authors.initials: FL
authors.lastname: Kong
authors.forename: Dong-hai
authors.initials: DH
authors.lastname: Huang
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis; D003252:Construction Materials; D004391:Dust / Q000032:analysis; D006801:Humans; D016273:Occupational Exposure / Q000032:analysis* / Q000517:prevention & control*; D017132:Workplace
chemical_list: D000395:Air Pollutants, Occupational; D004391:Dust