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tdSs at..dy. tdo osons a+.t.r flow rat .s wre oalibratad to 100 l.illi-
lit.rs per aiaAO with a tolaranoo of ons si]lilitor par aiinrto .
!be sl.tsss wro ealibratad tor fLor w .kay . .ind the sato of saoant
ot a sinile b.bblo of soap np a 100 slillilitar b.rat .boso top bad
bwa attseD.d to tLe air iatate of the ..tw. statio ealibration !s
mt possible d.e to osoua'a roaoti.itt. D:a.aie eal3bratfoa vsa ..not
possibl. b .ostts, of tbs aost of tLe apparatw .
Doaoriotion of tDU ti .ld staly
Iadoor and ontdoor lo.als of earbon womslds and esoas wro ooni-
torad on a ooertianons tv.ntp-fonr bonr basis in tLis study. Stinnty-
tw boas. . in all were stadi.d lor,pariods of ti.s ramiad from tluw
.ontba to thr.. days . ?ba a..raje dnration of data-taiciig in a Aow.
•ss tonrt. .n days . sist ..n boas .s yi.1d .d data tiorW of swiw. iwo
Low.s w.r. .liaiaat.d b.cauae the awldoets obj.ot.d to tb. nois* of
the iartrm.nts and discoamt .d tU.a. B.tL tios tonr Mnsoa Yare
r.j.ct.d b.canse of initswnt pooblasa .
a.apllng sitp ti.r" s.S.ot.d so that .dstw33t all d.oRrapbio
ar.s in o .tropolitan .*tilvsnicN would be r.paw.at.d . Ooa liaitation
oas tae arit .rion that rasid .nts must appro.o ooatlonow .onitorin=
ia tb .ir boa... S.cause of this . sit.a cannot be oouldarad trn'ly
rsdo.. Looations of tb . Lous .s sampled ar. .Down in l'lNrs 3. • In
?abl. I aro liti.d tb. addiwsw and a~pro~daat. dittauos tirom
lalwuk ..'s downtown doosraphio o.ntor (Wiroon.in l.ana. at the
xilwvk.. Ri.ar) . Inforaation about type of bn9diad . ase of baildind .
and typ. of loeal. In .hios it is sitaat.d 1a pw.nt.d In tsb1 . II .
Considarablj nor* dat4 tban usual wr* obtainad trsm sitas
and I b:canse they v.re the rsid .m .s of tDo author or elos. r.lati.s .
In tb.se tw]d .nos, tDars r.r. ainiaal restrictions os tho pasitionim at
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