May 18, 2021
Findings In The Current Study
Plants are great, but they don39;t actually clean indoor air quickly enough to
have an effect on the air quality of your home or office environment," said
Michael Waring, PhD, an associate professor of architectural and environmental
engineering in Drexel39;s College of Engineering. But according to findings in
the current study, it would take between 10 and 1,000 plants per square meter of
floor space to compete with the air cleaning capacity of a building39;s air
handling system or even just a couple of open windows in a house.
The current
study39;s data from volumes of potted plant research one step farther, by using
it to calculate a measure called the "clean air delivery rate," or "CADR.Many of
these studies did show a reduction in the concentration of volatile organic
compounds over time, which is likely why people have seized on them to extol the
air-purifying virtues of plants."The CADR is the standard metric used for
scientific study of the impacts of air purifiers on indoor environments, but
many of the researchers conducting these studies were not looking at them from
an environmental engineering perspective and did not understand how building air
exchange rates interplay with the plants to affect indoor air quality," Waring
said.
Researchers reviewed a dozen studies, spanning 30 years of research, to
draw their conclusions. Their central finding is that the natural or ventilation
air exchange rates in indoor environments, like homes and offices, dilute
concentrations of volatile organic compounds -- the air pollution that plants
are allegedly cleaning -- much faster than plants can extract them from the
air.end-ofTags: indoor plants, air pollution, purified air."Typical for these
studies, a potted plant was placed in a sealed chamber (often with a volume of a
cubic meter or smaller), into which a single VOC was injected, and its decay was
tracked over the course of many hours or days," wrote the researchers. But
it39;s also a great example of how scientific research should continually
re-examine and question findings to get closer to the ground truth of
understanding what39;s actually happening around us," Waring said.
But the
problem with this experiment, and others like it, is that they were conducted in
a sealed chamber in a lab -- a contained environment that has little in common
with a house or office."This has been a common misconception for some time.The China gas flowmeter for sale
high-profile experiment that seemed to create the myth of houseplants as air
purifiers happened in 1989 when NASA, in search of ways to clean the air on
space stations, declared that plants could be used to remove cancer-causing
chemicals from the air.
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May 07, 2021
Desperate And Deteriorating Conditions
The Balkans struggled with a growing backlog of migrants on Monday as thousands
of people waited on cold, wet borders after Hungary closed its southern frontier
and diverted them to Slovenia.Groups of migrants fought with each other in the
morning, aid workers said, after a night spent under open skies lashed by autumn
wind and rain.end-ofLocation: Slovenia, Osrednjeslovenska, Ljubljana.
Hungary’s
right-wing government says the mainly Muslim migrants pose a threat to Europe’s
prosperity, security and "Christian valuesâ€, and has sealed its borders with
Serbia and Croatia with a steel fence and new laws that rights groups say deny
refugees their right to seek protection. The Balkans struggled with a growing
backlog of migrants on Monday as thousands of people waited on cold, wet borders
after Hungary closed its southern frontier and diverted them to Slovenia. "It’s
like a big river of people, and if you stop the flow, you will have floods
somewhere.
Slovenia found itself dragged into the path of the greatest migration
of people in Europe since World War Two after Hungary sealed its border with
Croatia on Friday. It is also courting Turkey with the promise of money, easier
EU travel for Turks and "re-energised†accession talks if Ankara tries to stem
the flow of migrants across its territory. Most refugees want to reach Germany,
which for the moment is letting them enter. "Open the gate, open the gate!†they
chanted, their passage barred by lines of Croatian police who on Monday erected
an improvised fence to control access.A country of two million people bordering
Hungary, Italy, Austria and Croatia, Slovenia said it would only allow in as
many as it could register, accommodate and send on to Austria.
The EU has agreed
a plan, resisted by Hungary and several other ex-Communist members of the bloc,
to share out 120,000 refugees.What initially looked like a smooth and
well-coordinated response by fellow ex-Yugoslav republics Slovenia and Croatia
quickly broke down into gas flowmeter for
sale the kind of discord and disarray that has characterised Europe’s
response to the hundreds of thousands reaching its shores by boat across the
Medit-erranean and Aegean seas, many of them Syrians fleeing war.
That’s what’s
happening now,†Unhcr spokesman Melita Sunjic said from the Serbia-Croatia
border, where about 2,000 people were stranded in desperate and deteriorating
conditions.Slovenia imposed a daily limit of 2,500, forcing fellow European
Union-member Croatia to also ration entry from Serbia, which the United Nations
refugee agency said was hosting more than 10,000 migrants on Monday, with more
on the way. It said Austria had limited its own intake, something Vienna denied
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