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Assessment of silica dust exposure profile in relation to prevalence of silicosis among Indian sandstone mine workers: Need for review of standards.
Am J Ind Med. 2020 03; 63(3):277-281.AJ

Abstract

BACKGROUND

In Indian mines, the prescribed exposure limit (PEL) for free silica dust is 0.15 mg/m3 which is much higher than those of OSHA and the ACGIH. Because of the reporting of high numbers of silicosis cases among Indian sandstone mine workers, the present study was designed to assess the dust exposure profile of the workers and to substantiate correlation of silica exposure with radiographic findings of silicosis.

METHODS

A cross-sectional study of 1012 workers actively engaged in sandstone mining was conducted. Chest x-rays were evaluated by the ILO Classification for the detection of pneumoconiosis. Representative 26 personal dust samples were collected using a personal dust sampler and free silica content estimated.

RESULTS

Radiographs compatible with silicosis were seen in 12.3% of workers, of which about 90% were ILO category 1 & 2. Prevalence of abnormal profusion increased from 2.9% to 13.1% to 22% as work exposure increased from <10 to 11 to 20 to >20 years, respectively. In dust samples, the mean silica concentration was 0.12 mg/m3 with 70% samples below the prescribed standard of 0.15 mg/m3 .

CONCLUSION

The study indicates that silica exposure below the prescribed limit in India is likely to be harmful. The PEL for crystalline silica in India of 0.15 mg/m3 is not adequately protective. Hence, there is an urgent need to reduce exposure to silica in these workplaces to prevent silicosis and to review the present standards as the government of India remains committed to the elimination of silicosis by 2030.

Authors+Show Affiliations

Occupational Health, National Institute of Miners' Health, Nagpur, India.Occupational Health, National Institute of Miners' Health, Nagpur, India.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

31773774

Citation

Dhatrak, Sarang, and Subroto Nandi. "Assessment of Silica Dust Exposure Profile in Relation to Prevalence of Silicosis Among Indian Sandstone Mine Workers: Need for Review of Standards." American Journal of Industrial Medicine, vol. 63, no. 3, 2020, pp. 277-281.
Dhatrak S, Nandi S. Assessment of silica dust exposure profile in relation to prevalence of silicosis among Indian sandstone mine workers: Need for review of standards. Am J Ind Med. 2020;63(3):277-281.
Dhatrak, S., & Nandi, S. (2020). Assessment of silica dust exposure profile in relation to prevalence of silicosis among Indian sandstone mine workers: Need for review of standards. American Journal of Industrial Medicine, 63(3), 277-281. https://doi.org/10.1002/ajim.23077
Dhatrak S, Nandi S. Assessment of Silica Dust Exposure Profile in Relation to Prevalence of Silicosis Among Indian Sandstone Mine Workers: Need for Review of Standards. Am J Ind Med. 2020;63(3):277-281. PubMed PMID: 31773774.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Assessment of silica dust exposure profile in relation to prevalence of silicosis among Indian sandstone mine workers: Need for review of standards. AU - Dhatrak,Sarang, AU - Nandi,Subroto, Y1 - 2019/11/26/ PY - 2019/11/12/accepted PY - 2019/06/12/received PY - 2019/10/23/revised PY - 2019/11/28/pubmed PY - 2021/5/1/medline PY - 2019/11/28/entrez KW - permissible exposure limit KW - review KW - silica exposure KW - silicosis KW - standards SP - 277 EP - 281 JF - American journal of industrial medicine JO - Am J Ind Med VL - 63 IS - 3 N2 - BACKGROUND: In Indian mines, the prescribed exposure limit (PEL) for free silica dust is 0.15 mg/m3 which is much higher than those of OSHA and the ACGIH. Because of the reporting of high numbers of silicosis cases among Indian sandstone mine workers, the present study was designed to assess the dust exposure profile of the workers and to substantiate correlation of silica exposure with radiographic findings of silicosis. METHODS: A cross-sectional study of 1012 workers actively engaged in sandstone mining was conducted. Chest x-rays were evaluated by the ILO Classification for the detection of pneumoconiosis. Representative 26 personal dust samples were collected using a personal dust sampler and free silica content estimated. RESULTS: Radiographs compatible with silicosis were seen in 12.3% of workers, of which about 90% were ILO category 1 & 2. Prevalence of abnormal profusion increased from 2.9% to 13.1% to 22% as work exposure increased from <10 to 11 to 20 to >20 years, respectively. In dust samples, the mean silica concentration was 0.12 mg/m3 with 70% samples below the prescribed standard of 0.15 mg/m3 . CONCLUSION: The study indicates that silica exposure below the prescribed limit in India is likely to be harmful. The PEL for crystalline silica in India of 0.15 mg/m3 is not adequately protective. Hence, there is an urgent need to reduce exposure to silica in these workplaces to prevent silicosis and to review the present standards as the government of India remains committed to the elimination of silicosis by 2030. SN - 1097-0274 UR - https://www.unboundmedicine.com/medline/citation/31773774/Assessment_of_silica_dust_exposure_profile_in_relation_to_prevalence_of_silicosis_among_Indian_sandstone_mine_workers:_Need_for_review_of_standards_ DB - PRIME DP - Unbound Medicine ER -