Observations on Atmospheric Air Pollution Causes by Asbestos

Our plain-English summary of Observations on Atmospheric Air Pollution Causes by Asbestos, by A. Laamanen, L. Noro, V. Raunio (1965).

The study

• Authors: A. Laamanen, L. Noro, V. Raunio
• Published: Annals of the New York Academy of Sciences (1965)
• Type of article: Conference paper
• Our copy: from Johns-Manville's own medical library. The article is still under copyright, so we describe it here rather than post it.

In plain English

This article reported two preliminary surveys of asbestos dust around anthophyllite asbestos mines in Finland. The first, from August 20 to November 28, 1961, collected settling dust at 13 sites up to 13.5 km from the mines with British Deposit Gauges, measuring asbestos by X-ray diffraction. Amounts were deposits in grams per 100 of an area unit illegible in the scan, per month. The highest, 34.6, was at a site 0.5 km from the mines, which lay to its southwest. That was almost three times the 12.7 found at the same distance at a site with the mines to its north. Amounts depended on distance and wind, and sites sheltered by a hill or forest collected little. The second survey, June 25 to November 29, 1963, extended sampling to 50 km. It found 0.88 at 18 km and 1.38 at 27 km. Traces at 25 and 50 km, the authors surmised, may have come with insects found in the bottles. The authors concluded that asbestos dust spread rather extensively, varying with distance and prevailing winds.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Environmental air pollution survey: two rounds of dust-deposition sampling around mines, with weather observations
• Who was studied: Sampling sites, not people. The first survey (August 20 to November 28, 1961) used 13 sites around the mines, up to 13.5 km away. The second survey (June 25 to November 29, 1963) used sites up to 50 km away in five communities in Finland.
• Exposure: Anthophyllite asbestos dust from mining (quarrying) and milling, with production of about 15,000 tons per year
• Main results:
  • Deposits were measured in grams per 100 of an area unit per month. The area unit is illegible in the scan. In the first survey, the control site 4 km away had 0.8 in these units.
  • In the first survey, the largest amount was 34.6, at a site 0.5 km from the mines. The table gives the direction of the mines from each site, and here the mines lay to the southwest of the site.
  • In the first survey, the amount at that site (point 0.5 S.W.) was almost three times the amount at a corresponding distance in almost the opposite direction. That was 12.7, at a site with the mines to its north. The authors attributed this to prevailing south or southwest winds.
  • In the first survey, the amount of asbestos deposited depended on distance from the mines, and also on geographical and meteorological conditions.
  • Sites located behind a hill and behind a forest collected only minor amounts compared with other sites at the same distance.
  • In the second survey, 1.38 was found at a site 27 km from the mines, with the mines to its south. Another site, 18 km away with the mines to its southeast, had 0.88. The authors explained this by frequent south or southwest winds with relatively high velocities.
  • In the second survey, only traces were found at one of the twin sites 25 km from the mines and at the site 50 km away. Insects were found in the sampling bottles, and the authors surmised that the traces came with the insects.
  • The control site 4 km from the mines (point 4 S) had a greater amount of asbestos in the second survey than in the first (0.8). The authors attributed this to more favorable wind directions and rainfall.
  • In the published discussion, co-author L. Noro stated that the fibers collected at 25 km were identified as anthophyllite by X-ray diffraction.
• The authors' conclusion: The authors concluded that these two preliminary surveys indicate asbestos dust is spread rather extensively from the mining and milling areas, with the degree of pollution varying with distance from the source and the prevailing winds. They noted that work was continuing on the relation between pleural plaques and the degree of air pollution.
• Limitations the authors state:
  • The authors described the findings as preliminary observations.
  • The insects found in the sampling bottles were not identified, and the asbestos traces were not checked under a microscope.

Topics

Medical terms in this study, explained in our Lexicon: Anthophyllite, X-Ray Diffraction (XRD).

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