Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Июнь 4, 2025
Stabilized
Criegee
intermediates
(sCIs)
are
key
reactive
species
in
atmospheric
chemistry.
Styrene-like
compounds
special
aromatics,
as
they
can
react
with
the
ozone
to
generate
phenyl-substituted
sCIs
(C6H5CHOO),
yet
no
prior
study
has
directly
characterized
such
sCIs.
This
took
styrene
and
trans-β-methylstyrene
proxies
for
styrene-like
compounds.
Matrix
isolation
combined
infrared
spectroscopy
technology
was
applied
capture
anti-
syn-C6H5CHOO
at
972
930
cm-1,
respectively.
Quantum
chemical
calculations
enabled
identification
of
verified
reactivity
sCIs'
unimolecular
decomposition
bimolecular
reactions
water
vapor.
Besides
reported
organic
peroxy
radical
(RO2)
+
hydroperoxy
(HO2)
reactions,
oligomers
formed
via
RO2
R'O2,
HO2
HO2/R'O2,
highly
oxygenated
HO2/R'O2
were
also
proposed
based
on
chamber
experiments.
At
higher
relative
humidity,
C6H5CHOO-related
emerged
most
prominent
aerosol
components.
The
insertion
C6H5CHOO
units
found
dramatically
reduce
oligomer
volatility
enhance
toxicity.
lower
susceptibility
removal
by
vapor
suggests
more
competitive
particle
generation
even
nucleation
involving
C6H5CHOO,
providing
insights
into
urban
air
pollution
mechanisms
toxic
particles.
Environment International,
Год журнала:
2023,
Номер
183, С. 108361 - 108361
Опубликована: Ноя. 30, 2023
Due
to
the
implementation
of
air
pollution
control
measures
in
China,
quality
has
significantly
improved,
although
there
are
still
additional
issues
be
addressed.
This
study
used
long-term
trends
pollutants
discuss
achievements
and
challenges
further
improving
China.
The
Kolmogorov-Zurbenko
(KZ)
filter
multiple-linear
regression
(MLR)
were
quantify
meteorology-related
emission-related
from
2014
2022
KZ
analysis
showed
that
PM2.5
decreased
by
7.36
±
2.92
%
yr−1,
while
daily
maximum
8-h
ozone
(MDA8
O3)
an
increasing
trend
with
3.71
2.89
yr−1
decrease
increase
MDA8
O3
primarily
attributed
changes
emission,
relative
contribution
85.8%
86.0%,
respectively.
Meteorology
variations,
including
increased
ambient
temperature,
boundary
layer
height,
reduced
humidity,
also
contributed
reduction
enhancement
O3.
exhibited
continuous
increase,
respectively,
2022,
variation
rates
slowed
during
2018-2020
compared
2014-2017,
highlighting
quality,
particularly
simultaneously
reducing
recommends
NH3
emissions
agriculture
sector
rural
areas
transport
urban
levels.
Addressing
requires
precursor
gases
based
on
site-specific
atmospheric
chemistry
considerations.
Journal of Forestry Research,
Год журнала:
2023,
Номер
34(6), С. 1653 - 1656
Опубликована: Авг. 5, 2023
Abstract
While
bird
populations
are
declining,
the
factors
associated
with
this
decline
unclear.
Based
on
laboratory
experiments,
air
pollution
has
long
been
recognized
as
a
factor
causing
oxidative
stress
and
adversely
affecting
health.
Recently,
studies
employing
an
epidemiological
approach
have
reported
significant
declines
in
avian
Central
Europe
United
States
due
to
pollution,
ozone
particular.
We
advocate
that
urgent
actions
needed
mitigate
these
effects,
which
threaten
biodiversity
environmental
health,
propose
series
of
measures
can
enlighten
path
toward
mitigating
effects
populations.
