Elementa Science of the Anthropocene,
Год журнала:
2022,
Номер
10(1)
Опубликована: Янв. 1, 2022
Effective
emission
reductions
of
some
primary
pollutants
have
brought
down
aerosol
loadings
but
led
to
increasing
relative
importance
secondary
pollutants,
as
was
indicated
by
the
rising
O3
levels
during
warm
seasons
within
urban
and
suburban
areas
China,
which
has
received
much
attention
in
recent
years,
especially
North
China
Plain
(NCP).
This
raised
serious
concerns
on
its
agricultural
impacts,
were
mainly
evaluated
based
upon
model
simulations
or
urban/suburban
measurements
due
a
lack
long-term
rural
observations.
In
this
study,
we
present
highly
valuable
continuous
observations
at
NCP
site
2013–2019.
Compared
nearby
sites,
experienced
increased
levels,
exhibited
decreasing
mole
fractions.
While
fractions
AOT40
widely
sites
from
2013
2019,
(GC)
revealed
decreases,
summer
autumn
with
greater
rates
for
AOT40.
A
reassessment
impacts
region
performed
using
observations,
resulting
wheat,
maize
soybean
averaged
yield
losses
37
±
14,
8
4
30
13%
yr–1,
respectively.
crop
yields
economic
did
not
increase
suggested
previous
estimations
data.
Our
analyses
high
overestimations
(i.e.,
average
differences
estimated
production
loss
reaching
53%,
112%
75%,
respectively,
maize,
soybean).
Despite
alleviated
total
cost
Hebei
province
still
took
up
0.89%
gross
domestic
(3.47
×
1012
USD)
province.
Since
National
Environmental
Monitoring
Center
aims
monitoring
populated
areas,
observation
representative
regions
are
lacking
across
China.
The
current
study
highlights
urgent
necessity
establishment
networks
encourages
extensive
field
experiments
exposure–response
relationships
different
crops
varieties
more
accurate
impact
evaluations.
Additionally,
explorations
into
underlying
mechanisms
behind
reversed
temporal
variation
between
should
be
conducted
future
development
pollution
control
strategies.
Atmospheric chemistry and physics,
Год журнала:
2022,
Номер
22(20), С. 13467 - 13493
Опубликована: Окт. 19, 2022
Abstract.
The
importance
of
dust
heterogeneous
oxidation
in
the
removal
atmospheric
SO2
and
formation
sulfate
aerosols
is
not
adequately
understood.
In
this
study,
Fe-,
Ti-,
Al-bearing
components,
Na+,
Cl−,
K+,
Ca2+
surface,
were
discovered
to
be
closely
associated
with
sulfate.
Regression
models
then
developed
make
a
reliable
prediction
reactivity
based
on
particle
chemical
compositions.
Further,
recognized
gas-phase,
aqueous-phase,
routes
quantitatively
assessed
kinetically
compared
by
combining
laboratory
work
modelling
study.
presence
55
µg
m−3
airborne
dust,
accounts
for
approximately
28.6
%
secondary
during
nighttime,
while
proportion
decreases
13.1
solar
irradiation.
On
drivers
(e.g.
transition
metal
constituents,
water-soluble
ions)
are
more
efficient
than
surface-adsorbed
oxidants
H2O2,
NO2,
O3)
conversion
SO2,
particularly
nighttime.
Dust
offers
an
opportunity
explain
missing
source
severe
haze
pollution
events,
its
contribution
complex
environments
could
even
higher
current
calculation
results.
Overall,
surface
responsible
significant
have
profound
impacts
sulfur
cycling.
Environmental Science & Technology,
Год журнала:
2021,
Номер
55(6), С. 3568 - 3581
Опубликована: Март 3, 2021
Peroxyacetyl
nitrate
(PAN)
is
an
important
indicator
for
photochemical
pollution,
formed
similar
to
ozone
in
the
photochemistry
of
certain
volatile
organic
compounds
(VOCs)
presence
nitrogen
oxides,
and
has
displayed
surprisingly
high
concentrations
during
wintertime
that
were
better
correlated
particulate
rather
than
concentrations,
which
reasons
remained
unknown.
In
this
study,
observations
PAN,
VOCs,
PM2.5,
HONO,
various
trace
gases
investigated
find
relationship
between
aerosols
PAN
formation.
Wintertime
pollution
was
affirmed
by
(average:
1.2
±
1.1
ppb,
maximum:
7.1
ppb),
despite
low
concentrations.
determined
its
oxygenated
VOC
(OVOC)
precursor
NO/NO2
ratios
can
be
well
parameterized
based
on
understanding
their
chemical
relationship.
Data
analysis
box
modeling
results
suggest
formation
mostly
contributed
aging
processes
involving
OH
oxidation
or
photolysis
ozonolysis
pathways.
Heterogeneous
reactions
have
supplied
key
oxidants
such
as
produced
radicals
upon
photolysis,
promoting
OVOC
thereby
enhancing
production,
explaining
observed
PM2.5-OVOC-PAN
intercorrelation.
turn,
parts
these
OVOCs
might
participate
secondary
aerosol,
further
aggravating
haze
a
feedback.
Low
temperatures
enable
long-range
transport
downwind
regions,
how
will
impact
capacity
requires
assessment
future
studies.
Atmospheric chemistry and physics,
Год журнала:
2021,
Номер
21(4), С. 3181 - 3192
Опубликована: Март 3, 2021
Abstract.
Biomass
burning
activities
are
ubiquitous
in
China,
especially
northern
where
there
is
a
large
rural
population
and
winter
heating
custom.
tracers
(i.e.,
levoglucosan,
mannosan
potassium
(K+)),
as
well
other
chemical
components,
were
quantified
at
site
(Gucheng,
GC)
China
from
15
October
to
30
November,
during
transition
season,
when
the
field
of
agricultural
residue
was
becoming
intense.
The
measured
daily
average
concentrations
K+
PM2.5
(particulate
matter
with
aerodynamic
diameters
less
than
2.5
µm)
this
study
0.79
±
0.75,
0.03
1.52
0.62
µg
m−3,
respectively.
Carbonaceous
components
biomass
showed
higher
levels
nighttime
daytime,
while
secondary
inorganic
ions
enhanced
daytime.
An
episode
high
encountered
end
2016,
levoglucosan
4.37
m−3.
Based
on
comparison
different
pollution
periods,
it
appeared
that
combustion
can
obviously
elevate
carbonaceous
component
levels,
whereas
essentially
no
effect
aerosols
ambient
air.
Moreover,
/
ratios
periods
remained
values
(in
range
18.3–24.9);
however,
ratio
significantly
elevated
intensive
period
(1.67)
air
temperatures
decreasing,
which
substantially
(averaged
0.47).
Atmospheric chemistry and physics,
Год журнала:
2022,
Номер
22(7), С. 5017 - 5031
Опубликована: Апрель 14, 2022
Abstract.
Coarse
particulate
matter
(i.e.
PM
with
an
aerodynamic
diameter
between
2.5
and
10
µm
–
PM2.5
PM10
or
PMcoarse)
has
been
increasingly
recognized
for
its
importance
in
regulation
because
of
growing
proportion
the
accumulative
evidence
adverse
health
impact.
In
this
work,
we
present
comprehensive
PMcoarse
speciation
results
obtained
through
a
1-year-long
(January
2020–February
2021)
joint
chemical
study
Hong
Kong,
coastal
highly
urbanized
city
southern
China.
The
annual
average
concentration
is
14.9
±
8.6
µg
m−3
(±
standard
deviation),
accounting
45
%
(32.9
18.5
m−3).
measured
components
explain
∼75
mass.
unexplained
part
contributed
by
unmeasured
geological
residue
liquid
water
content,
supported
analyses
positive
matrix
factorization
(PMF)
thermodynamic
equilibrium
model
ISORROPIA
II.
mass
apportioned
to
four
sources
resolved
PMF,
namely
soil
dust/industrial
coal
combustion,
construction
dust/copper-rich
emissions,
fresh
sea
salt,
aged
salt
factor
containing
secondary
inorganic
aerosols
(mostly
nitrate).
source
composition
exhibit
distinct
seasonal
variation,
result
mainly
driven
areas
air
masses
have
travelled
as
revealed
back-trajectory
analysis.
summer
when
site
dominated
marine
mass,
lowest
(average
=
8.1
m−3)
largest
contributor
(47
%),
followed
two
dust
factors
(36
total).
winter
receives
from
northern
continental
region,
triples
(24.8
m−3),
contributing
three
quarters
aerosol
potential
are
mapped
using
concentration-weighted
trajectory
technique,
showing
either
Greater
Bay
Area
greater
China
origin
fugitive
emissions
leading
elevated
ambient
loadings
Kong.
This
study,
first
kind
our
provides
relevant
guidance
other
locations
similar
monitoring
needs.
Additionally,
findings
point
need
further
research
on
sources,
transport,
processes,
effects
PMcoarse.
Critical Reviews in Environmental Science and Technology,
Год журнала:
2023,
Номер
53(21), С. 1888 - 1911
Опубликована: Март 31, 2023
The
oxidation
of
sulfur
dioxide
(SO2)
to
sulfate
in
the
atmosphere
is
an
important
concern
regional
air
quality,
global
climate
change,
and
human
health.
While
gas-phase
liquid-phase
SO2
are
widely
regarded
as
sources
sulfate,
contribution
heterogeneous
process
on
particle
surfaces
controversial.
Recently,
this
chemistry
has
been
considered
be
mechanism
that
missing
current
models
explain
concentrations
observed
haze
episodes
East
Asia.
Therefore,
particles
under
conditions
complex
pollution
needs
reassessed.
This
review
summarizes
fundamental
understanding
reactions
solid
such
mineral
dust,
black
carbon,
sea
salts,
organic
aerosol,
so
on.
factors
affecting
kinetics
SO2,
including
coexisting
components
(O3,
NO2,
H2O2,
NH3,
VOCs),
reactive
sites,
surface
properties,
relative
humidity,
illumination,
reviewed.
Reactive
oxygen
species
involved
discussed.
To
our
knowledge,
while
previous
reviews
have
appeared
aqueous-phase,
first
atmospheric
particles,
which
can
help
cycle
its
environmental
impacts.
A
number
recommendations
for
future
research
also
presented.
ACS Applied Materials & Interfaces,
Год журнала:
2021,
Номер
13(42), С. 50401 - 50410
Опубликована: Окт. 12, 2021
Metal-organic
framework
(MOF),
an
emerging
class
of
porous
hybrid
inorganic-organic
crystals,
has
been
applied
for
various
environmental
remediation
strategies
including
liquid
and
air
filtration.
In
this
study,
the
role
zeolite
imidazole
framework-8
(ZIF-8)
was
explored
on
charge
trapping
ability
its
contribution
to
capturing
targeted
pollutants
NaCl
nanoparticles
SO2
gas.
Poly(lactic
acid)
fibers
with
controlled
surface
pores
were
electrospun
using
water
vapor-induced
phase
separation,
fiber
uniformly
coated
ZIF-8
crystals
via
in
situ
growth
method.
As
a
novel
process
approach,
corona
charging
grown
webs.
The
promoted
process,
charged
web
showed
significantly
improved
electrostatic
filtration
efficiency.
Also,
enhanced
capture
ability,
both
static
dynamic
flow
states,
demonstrating
applicability
as
bifunctional
filter
particulate
gaseous
matters.
approach
study
is
that
gas
capabilities
associated
ZIF-8,
implementing
