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Personal exposure to dust, endotoxin and crystalline silica in California agriculture.
Ann Occup Hyg. 1999 Jan; 43(1):35-42.AO

Abstract

AIMS

The aim of this study was to measure personal exposure to dust, endotoxin and crystalline silica during various agricultural operations in California over a period of one year.

METHODS

Ten farms were randomly selected in Yolo and Solano counties and workers were invited to wear personal sampling equipment to measure inhalable and respirable dust levels during various operations. The samples were analysed for endotoxin using the Limulus Amebocyte Lysate assay and crystalline silica content using X-ray diffraction. In total 142 inhalable samples and 144 respirable samples were collected.

RESULTS

The measurements showed considerable difference in exposure levels between various operations, in particular for the inhalable fraction of the dust and the endotoxin. Machine harvesting of tree crops (Geometric mean (GM) = 45.1 mg/m3) and vegetables (GM = 7.9 mg/m3), and cleaning of poultry houses (GM = 6.7 mg/m3) showed the highest inhalable dust levels. Cleaning of poultry houses also showed the highest inhalable endotoxin levels (GM = 1861 EU/m3). Respirable dust levels were generally low, except for machine harvesting of tree crops (GM = 2.8 mg/m3) and vegetables (GM = 0.9 mg/m3). Respirable endotoxin levels were also low. For the inhalable dust fraction, levels were reduced considerably when an enclosed cabin was present. The percentage of crystalline silica was overall higher in the respirable dust samples than the inhalable dust samples.

CONCLUSIONS

Considerable differences exist in personal exposure levels to dust, endotoxin and crystalline silica during various agricultural operations in California agriculture with some operations showing very high levels.

Authors+Show Affiliations

Imperial College of Science, Technology and Medicine, London, U.K. m.nieuwenhuijsen@ic.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

10028892

Citation

Nieuwenhuijsen, M J., et al. "Personal Exposure to Dust, Endotoxin and Crystalline Silica in California Agriculture." The Annals of Occupational Hygiene, vol. 43, no. 1, 1999, pp. 35-42.
Nieuwenhuijsen MJ, Noderer KS, Schenker MB, et al. Personal exposure to dust, endotoxin and crystalline silica in California agriculture. Ann Occup Hyg. 1999;43(1):35-42.
Nieuwenhuijsen, M. J., Noderer, K. S., Schenker, M. B., Vallyathan, V., & Olenchock, S. (1999). Personal exposure to dust, endotoxin and crystalline silica in California agriculture. The Annals of Occupational Hygiene, 43(1), 35-42.
Nieuwenhuijsen MJ, et al. Personal Exposure to Dust, Endotoxin and Crystalline Silica in California Agriculture. Ann Occup Hyg. 1999;43(1):35-42. PubMed PMID: 10028892.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Personal exposure to dust, endotoxin and crystalline silica in California agriculture. AU - Nieuwenhuijsen,M J, AU - Noderer,K S, AU - Schenker,M B, AU - Vallyathan,V, AU - Olenchock,S, PY - 1999/2/24/pubmed PY - 1999/2/24/medline PY - 1999/2/24/entrez SP - 35 EP - 42 JF - The Annals of occupational hygiene JO - Ann Occup Hyg VL - 43 IS - 1 N2 - AIMS: The aim of this study was to measure personal exposure to dust, endotoxin and crystalline silica during various agricultural operations in California over a period of one year. METHODS: Ten farms were randomly selected in Yolo and Solano counties and workers were invited to wear personal sampling equipment to measure inhalable and respirable dust levels during various operations. The samples were analysed for endotoxin using the Limulus Amebocyte Lysate assay and crystalline silica content using X-ray diffraction. In total 142 inhalable samples and 144 respirable samples were collected. RESULTS: The measurements showed considerable difference in exposure levels between various operations, in particular for the inhalable fraction of the dust and the endotoxin. Machine harvesting of tree crops (Geometric mean (GM) = 45.1 mg/m3) and vegetables (GM = 7.9 mg/m3), and cleaning of poultry houses (GM = 6.7 mg/m3) showed the highest inhalable dust levels. Cleaning of poultry houses also showed the highest inhalable endotoxin levels (GM = 1861 EU/m3). Respirable dust levels were generally low, except for machine harvesting of tree crops (GM = 2.8 mg/m3) and vegetables (GM = 0.9 mg/m3). Respirable endotoxin levels were also low. For the inhalable dust fraction, levels were reduced considerably when an enclosed cabin was present. The percentage of crystalline silica was overall higher in the respirable dust samples than the inhalable dust samples. CONCLUSIONS: Considerable differences exist in personal exposure levels to dust, endotoxin and crystalline silica during various agricultural operations in California agriculture with some operations showing very high levels. SN - 0003-4878 UR - https://www.unboundmedicine.com/medline/citation/10028892/Personal_exposure_to_dust_endotoxin_and_crystalline_silica_in_California_agriculture_ L2 - https://medlineplus.gov/occupationalhealth.html DB - PRIME DP - Unbound Medicine ER -