Atmospheric chemistry and physics,
Год журнала:
2024,
Номер
24(23), С. 13199 - 13217
Опубликована: Ноя. 29, 2024
Abstract.
Biogenic
volatile
organic
compounds
(BVOCs)
are
key
components
of
the
atmosphere,
playing
a
significant
role
in
formation
aerosols
(OAs).
However,
only
few
studies
have
simultaneously
examined
characteristics
BVOCs
and
OAs
forest
ecosystems
on
background
environmental
stressors,
such
as
consecutive
droughts
extensive
bark
beetle
infestations.
Here,
we
present
real-time
measurements
stressed
spruce-dominated
near
biogas
power
plant
(BPP)
western
Germany
during
June
2020.
A
proton-transfer-reaction
time-of-flight
mass
spectrometer
coupled
with
particle
inlet
(CHARON-PTR-ToF-MS)
Vocus-PTR-ToF-MS
were
used
to
measure
BVOCs.
The
average
OA
concentration
was
0.8
±
0.5
µg
m−3,
consisting
mainly
semi-volatile
monoterpene
oxidation
products.
mixing
ratios
isoprene
(0.58
0.54
ppb)
monoterpenes
(2.5
5.3
higher
than
values
previously
measured
both
German
temperate
forests
boreal
forests.
Based
wind
direction
analysis,
BVOC
data
categorized
into
two
groups:
one
influenced
by
biogenic
emissions
from
an
intact
clear-cut
area
(referred
group)
other
anthropogenic
BPP
village
group).
High
observed
group,
indicating
contribution
emissions.
In
variations
driven
interplay
between
meteorology,
their
photochemical
consumption.
Positive
matrix
factorization
analysis
VOCs
revealed
substantial
contributions
oxygenated
daytime,
while
weakly
oxidized
products
dominated
at
night.
Furthermore,
increasing
relative
humidity
decreasing
temperatures
promoted
gas-to-particle
partitioning
these
products,
leading
increase
nighttime
mass.
results
demonstrate
that
not
meteorological
conditions
but
also
local
subsequent
chemical
transformation
processes.
This
study
highlights
need
investigate
changes
European
Atmosphere,
Год журнала:
2024,
Номер
15(9), С. 1074 - 1074
Опубликована: Сен. 5, 2024
To
assess
the
impact
of
air
pollution
on
human
health
in
multiple
urban
areas
Greece,
hourly
concentrations
common
pollutants
(CO,
NO2,
O3,
SO2,
PM10,
and
PM2.5)
from
11
monitoring
stations
six
major
Greek
cities
(Athens,
Thessaloniki,
Patra,
Volos,
Ioannina,
Kozani),
were
used
to
implement
U.S.
EPA’s
Air
Quality
Index
(AQI)
during
a
seven-year
period
(2016–2022).
In
Athens,
capital
city
PM10
PM2.5
also
studied
relation
prevailing
wind
patterns,
while
episodes
exceeding
official
daily
EU
limit
(50
μg/m3)
analyzed
using
Potential
Source
Contribution
Function
(PSCF)
terms
mass
origin.
According
AQI
results,
by
far
most
hazardous
associated
with
moderate
unhealthy
conditions
all
areas.
addition,
where
benzene
levels
studied,
potential
inhalation
cancer
risk
(>1.0
×
10−6)
was
detected.
Saharan
dust
intrusions
downgraded
quality,
whilst
regional
transport
accumulation
local
emissions
triggered
increased
traffic
sites,
especially
cold
periods.
Our
study
highlights
need
for
development
early
warning
systems
emission
abatement
strategies
PM
Greece.
Atmosphere,
Год журнала:
2024,
Номер
15(6), С. 692 - 692
Опубликована: Июнь 6, 2024
Residential
biomass
combustion
emits
a
large
amount
of
organic
gases
into
ambient
air,
resulting
in
the
formation
secondary
aerosol
(SOA)
and
various
environmental
health
impacts.
In
this
study,
we
investigated
emission
characteristics
non-methane
compounds
(NMOCs)
from
residential
fuels
during
vigorous
(flaming)
stable
(smoldering)
conditions.
We
quantified
NMOC
factors
based
on
CO
concentration
for
different
phases
found
that
emissions
were
higher
smoldering
phase
approximately
two
to
four
times
greater
than
those
flaming.
NMOCs
categorized
volatile
(VOCs)
intermediate-volatility
(IVOCs)
through
modeling
compound
volatility
distribution.
The
photochemical
aging
revealed
furans,
phenolics,
certain
IVOCs
as
significant
non-traditional
SOA
precursors,
with
over
half
being
consumed
short
period.
A
parametric
function
was
established,
indicating
accounting
precursors
IVOC
yields
improves
representation
net
enhancement
measured
(OA).
This
study
emphasizes
importance
differentiating
recognizing
accurate
assessment
prediction.
Journal of Fire Sciences,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 5, 2024
Driven
by
the
necessity
to
understand
fire
and
smoke
dispersion
characteristics
of
electric
bicycle
(escooter)
fires
their
effects
on
residents’
safety
in
rural
houses,
this
study
was
conducted
perform
full-scale
experiments
a
village
house
Hainan,
People’s
Republic
China.
The
tested
building
is
typical
multi-story
representative
houses
southern
It
found
that
an
escooter
grows
rapidly
once
its
lithium-ion
battery
overcharged
ignite.
Inside
stairwell
where
escooters
are
parked,
significant
increase
temperature
over
60°C
across
all
floors
observed
maximum
reaches
up
800°C
first
floor.
Furthermore,
propagation
fast,
reaching
upper
within
5
minutes
filling
entire
7
minutes.
Due
stack
effect,
carbon
monoxide
concentration
highest
fourth
floor,
notably
higher
than
other
floors.
Closing
doors
rooms
occupants
typically
present
effectively
block
heat
transfer.
Thus,
case
escooter’s
undergoes
explosion
combustion,
it
better
residents
stay
closing
or
even
sealing
doors,
waiting
for
help
during
most
period.
However,
has
not
been
burning,
there
still
chances
evacuation
putting
out
flame.
Buildings,
Год журнала:
2024,
Номер
14(10), С. 3105 - 3105
Опубликована: Сен. 27, 2024
The
long-term
use
of
air
filters
causes
dust
to
accumulate
on
their
surfaces
or
fill
in
the
fibers
internal
filtering
materials
over
time,
thereby
greatly
reducing
effectiveness;
therefore,
cleaning
and
replacement
filter
public
buildings
are
great
concern.
most
commonly
used
non-woven
fabric
currently
market
taken
as
research
object
for
this
work,
which
experiments
conducted
ultrasonic
parameters,
performance,
regeneration
effects,
etc.
results
showed
that
best
performance
was
achieved
when
parameter
set
120
W,
time
11.2
s,
with
a
significant
effect
particulate
matter
particle
size
less
than
2.5
μm.
Under
premise
repeated
containment,
PM10,
PM2.5,
PM1.0
cleaned
nine,
six,
seven
times,
respectively,
filtration
these
particles
can
also
recover
85%
fresh
material
before
cleaning;
however,
after
ten
cleanings,
resistance
decreased
within
range
4.6~20.7
Pa.
In
study,
we
aim
effectively
reduce
old
generation
incineration
pollution,
carbon-dioxide-equivalent
emissions
providing
reference
value
achieving
efficient
utilization
under
dual
carbon
target.
Atmospheric chemistry and physics,
Год журнала:
2024,
Номер
24(23), С. 13199 - 13217
Опубликована: Ноя. 29, 2024
Abstract.
Biogenic
volatile
organic
compounds
(BVOCs)
are
key
components
of
the
atmosphere,
playing
a
significant
role
in
formation
aerosols
(OAs).
However,
only
few
studies
have
simultaneously
examined
characteristics
BVOCs
and
OAs
forest
ecosystems
on
background
environmental
stressors,
such
as
consecutive
droughts
extensive
bark
beetle
infestations.
Here,
we
present
real-time
measurements
stressed
spruce-dominated
near
biogas
power
plant
(BPP)
western
Germany
during
June
2020.
A
proton-transfer-reaction
time-of-flight
mass
spectrometer
coupled
with
particle
inlet
(CHARON-PTR-ToF-MS)
Vocus-PTR-ToF-MS
were
used
to
measure
BVOCs.
The
average
OA
concentration
was
0.8
±
0.5
µg
m−3,
consisting
mainly
semi-volatile
monoterpene
oxidation
products.
mixing
ratios
isoprene
(0.58
0.54
ppb)
monoterpenes
(2.5
5.3
higher
than
values
previously
measured
both
German
temperate
forests
boreal
forests.
Based
wind
direction
analysis,
BVOC
data
categorized
into
two
groups:
one
influenced
by
biogenic
emissions
from
an
intact
clear-cut
area
(referred
group)
other
anthropogenic
BPP
village
group).
High
observed
group,
indicating
contribution
emissions.
In
variations
driven
interplay
between
meteorology,
their
photochemical
consumption.
Positive
matrix
factorization
analysis
VOCs
revealed
substantial
contributions
oxygenated
daytime,
while
weakly
oxidized
products
dominated
at
night.
Furthermore,
increasing
relative
humidity
decreasing
temperatures
promoted
gas-to-particle
partitioning
these
products,
leading
increase
nighttime
mass.
results
demonstrate
that
not
meteorological
conditions
but
also
local
subsequent
chemical
transformation
processes.
This
study
highlights
need
investigate
changes
European
