Dispensary Corner 19 Aug 15
August 19, 2015
Dirt y buildings can actually
contribute further to pollution,
according to findings presented
at the recent American Chemical
Society conference.
The grime which “clings to urban
surfaces” actually emits noxious
gases when hit by sunlight, the
BBC reports.
Canadian and German scientists
conducted rooftop experiments
comparing grime in sun and
shade, with the sunlit surfaces
giving off nitrous acid and the
toxic pollutant NO2.
“Rather than being a permanent
sink for nitrogen oxide gases,
grime exposed to sunlight can
re-release some of these gases
back into the urban atmosphere,”
said James Donaldson from the
University of Toronto.
Aut horities in the US state
of Idaho have replaced one of
their highway mile markers in
an attempt to thwart a spate
of marijuana-loving would-be
thieves.
Cannabis has long been
associated with the code term
420, 4:20 or 4/20 - meaning
smokers sometimes like to purloin
souvenirs with the same number.
Idaho transportation officials
have foiled the problem by
replacing the 420 sign along U.S.
Highway 95, just south of the
town of Couer d’Alene, with one
labelled 419.9 (below).
Other states such as Washington
and Colorado have also been
forced to update
some of their
signs, but It’s not
an issue for many
US jurisdictions,
with most
highways in the
country being
shorter than 400
miles.
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