Document X7obvyVakoJRaa5a6LkJMr7pB

G n. 19711 hos noi been equcnlly ciillrsicd only c and after local noun, the strong inlradiurnal front 0 1 to 0 68 /iand is Ihe iiir mass value lar rudi.ilinn might be hi.r. I, u-niaming data like lo point uul that i appear lo explain the o- 0" 10" n for this inlradiurnal ' nil an evaluation of the tuiiURT (1941; Showed , o particles in tlic almot lion of the inlradiurnal ' tdy r^gexpbin forward . tomK D. Ranmmon ' : ' - ;'Tf-* ' " "'' .'idity over the United ` '-<76. i e. /. Ftonklin hut. the asbestos content '-.(nl ilal.i concerning lent procedures. > -f' Discussion' 667 1. Asbestos bodies nre only the lip of the iceberg, representing only Ihe largest fibres fincluding materials oilier than a.ticMps), visible hy optical microscopy, but missing fibres below ihe limit of resolution of the mclliiul. Rather, asbestos fibres and fibrils can he directly sought hy L'M in lungs of . cits tlwvllcrs--anil, when they arc, found I'ai mote frequently than coated bodies (I.am.ck cl til., 1971; Huoi.l v cl nl,, I"?0|. Moreover theic need not be the insecurity mneerning the nature of the asbestos body core fl svit.a ci /., 19711. As Moll and Young note, hy |.M chry entile aslvslos has a unique appearance. We know what we arc seeing. 2. 7 he aullinrs seem icsigncd lo being uual'lc In satisf.icliinls express the conccniralion of aslrcstos fihics in an. Adnullcdly, this cannot be done with line ptecisiiui. bin rather iclublc and i. pioslucilile C'liniates san be made. (Duplicate analysis nf samples in out I aburatoiy induaic a laslm of iwo or three is possible.) 7lic Iccltniqucs they i|uoie (X-ray chiliailiun a mi infrared s|>celromelrs j me loo insensitive foi Ihe purposes. (In the oilier band, mass eons cm rations can be calculated horn number and si/s' of fibrils, and the density nf chrysotile (Nirinii ws n at. P/7II. In the United Stales (or example, our early results showed the following concentrations u> be found in the air of New York (Set ncorr rt a!., 1972; Seuxorr tt t/., 1968). Tabu I. Cmrysotim costtint or amount AIR IK N.Y.C. RKtllMINARX At SUITS Sample locations Asbestos air level in 10" g nr* Manhattan lironx Drooklyn Queens Staten island 2S-00 2^28 19-22 18-29 11-21 - Additionally, specific sources of asbestos air pollution were defined from sampling near construction tiles. Tail* 2. Citavaomc content or N.Y.C. air in VICINITY Of SPRAY FIATRAOOF1NO WITH ASatSTOS- CONTAINING MATT AtAU --.* t *.r-1 Asbestos level in Site 10" g nf* ,. "^<1^- .. ' -- t I (downwind from source) afdownwind "(rwh source)' S (upwind from source) 20 49 U.S. title* and have found a&bcMos to he present in all. X It ii didiculi lo comment upon Ihe relevance of comparative lechniqtie*, in Ihe Absence of detailed dctcriplion. Nfmic reservations might he lifted with alteration* in mcih*d*. f:or example, wcic pidi (canned visually or >vere photographs made and fibrils counted (the Uucr is much more sensitive. NVe Ii Is evident ih.it o good deal now Vnown of tshcslo* air pollution and consequent, lung cimlaiuinaiion hy the uhiqnituus fibrils. Wlul has not yet been ilcciphcicd, ns Hull and lining citrrcclly stale, is Ihe disease potential of tuth general cuntmuniiy asbestos air pollution. Caneer may occur with occupational asbestos exposure, with that associated with neighborhood pollution i.-.-' -' I *'. ' . * ?V :> .. i . - > wV.* `, . . 00 0 ** WS PRODUCED BY FORD