Silicon DioxideSilicosisDustMiningQuartzAir Pollutants, OccupationalInhalation ExposureOccupational ExposureCeramicsDiatomaceous EarthPneumoconiosisCarbon Compounds, InorganicConstruction MaterialsIndustrySilicon CompoundsMaximum Allowable ConcentrationOccupational DiseasesSilica GelVolcanic EruptionsNational Institute for Occupational Safety and Health (U.S.)CrystallizationEnvironmental MonitoringTungstenLung NeoplasmsTrypanosoma lewisiGoldLungParticle SizeAir MovementsCosmic DustCaliforniaMacrophages, AlveolarBronchoalveolar Lavage FluidPulmonary FibrosisCarcinogensCohort StudiesRisk FactorsCase-Control StudiesRisk AssessmentSouth Africa