Atmosphere,
Journal Year:
2024,
Volume and Issue:
15(10), P. 1220 - 1220
Published: Oct. 13, 2024
The
rapid
formation
of
secondary
nitrate
(NO3−)
contributes
significantly
to
the
nocturnal
increase
PM2.5
and
has
been
shown
be
a
critical
factor
for
aerosol
pollution
in
North
China
Plain
(NCP)
region
summer.
To
explore
NO3−
pathways
influence
ozone
(O3)
on
production,
WRF-CMAQ
model
was
utilized
simulate
O3
co-pollution
events
NCP
region.
simulation
results
demonstrated
that
heterogeneous
hydrolysis
dinitrogen
pentoxide
(N2O5)
accounts
60%
67%
production
at
night
(22:00
05:00)
is
main
source
NO3−.
enhances
NO3
radicals,
thereby
further
promoting
N2O5
production.
In
evening
(20:00
21:00),
sustains
hydroxyl
(OH)
resulting
reaction
between
OH
radicals
nitrogen
dioxide
(NO2),
which
48%
64%
formation.
Our
suggest
effective
control
can
also
reduce
night.
npj Climate and Atmospheric Science,
Journal Year:
2024,
Volume and Issue:
7(1)
Published: July 4, 2024
Abstract
Recently,
nitrate
(NO
3
–
)
levels
in
winter
pollution
eastern
China
have
been
increasing
yearly
and
become
the
main
component
of
PM
2.5
.
The
factors
contributing
to
this
rise
surface
NO
concentrations
remain
unclear,
complicating
development
targeted
control
measures.
This
study
utilizes
observational
data
from
Shanghai
during
2019,
alongside
box
model
simulations,
recreate
−
event
identify
key
growth
process.
analysis
demonstrated
that
a
ozone
significantly
promotes
production
by
facilitating
x
conversion
via
gas-phase
heterogeneous
reactions.
These
findings
could
explain
correlation
between
synchronous
increase
recent
years.
Furthermore,
simulation
strategies
for
volatile
organic
compounds
(VOCs)
identified
an
approach
centered
on
reduction
as
notably
effective
mitigating
Yangtze
River
Delta.
Atmospheric chemistry and physics,
Journal Year:
2022,
Volume and Issue:
22(22), P. 14799 - 14811
Published: Nov. 22, 2022
Abstract.
Ozone
(O3)
has
become
a
significant
air
pollutant
in
China
recent
years.
O3
abatement
is
challenging
due
to
the
nonlinear
response
of
precursors
nitrogen
oxides
(NOx)
and
volatile
organic
compounds
(VOCs).
Photochemical
indicators
are
widely
used
estimate
O3–NOx–VOC
sensitivity,
this
important
policy
implications.
However,
effectiveness
seldom
been
evaluated.
This
study
examined
applications
four
that
include
ratio
production
rates
H2O2
HNO3
(PH2O2/PHNO3),
HCHO/NO2,
HCHO/NOy,
reactive
(NOy)
Yangtze
River
Delta
(YRD)
with
localized
thresholds.
The
overall
accuracy
was
high
(>92
%)
for
all
not
significantly
reduced
different
simulation
periods
or
locations
region.
By
comparing
isopleths,
it
found
HCHO/NO2
HCHO/NOy
showed
most
consistency,
whereas
PH2O2/PHNO3
tended
underestimate
(overestimate)
positive
NOx.
Additionally,
less
likely
attribute
formation
mixed
sensitivity
than
other
indicators,
demonstrated
preference
single-pollutant
control
strategy.
also
revealed
details
methodology
derive
threshold
values
impacted
results,
may
produce
uncertainties
application
photochemical
indicators.
Atmospheric chemistry and physics,
Journal Year:
2023,
Volume and Issue:
23(18), P. 10563 - 10578
Published: Sept. 25, 2023
Abstract.
Atmospheric
age
reflects
how
long
particles
have
been
suspended
in
the
atmosphere,
which
is
closely
associated
with
evolution
of
air
pollutants.
Severe
regional
haze
events
occur
frequently
China,
influencing
quality,
human
health,
and
climate.
Previous
studies
explored
characteristics
mass
concentrations
compositions
fine
particulate
matter
(PM2.5)
during
events,
but
atmospheric
remains
unclear.
In
this
study,
age-resolved
University
California,
Davis/California
Institute
Technology
(UCD/CIT)
model
was
developed
applied
to
simulate
concentration
distribution
PM2.5
a
severe
episode
eastern
China.
The
results
indicated
that
North
China
Plain
(NCP)
gradually
accumulated
due
stagnant
weather
conditions
beginning
stage
event.
Accordingly,
elemental
carbon
(EC),
primary
organic
aerosol
(POA),
sulfate
(SO42-),
secondary
(SOA)
increased.
subsequent
growth
driven
by
local
chemical
formation
nitrate
(NO3-)
under
high
relative
humidity.
newly
formed
NO3-
led
decrease
mean
particles.
During
transport
stage,
aged
from
NCP
moved
downwind
Yangtze
River
Delta
(YRD)
region,
leading
sharp
increase
average
EC,
POA,
SO42-,
SOA
YRD.
contrast,
ammonium
remained
unchanged
or
even
slightly
decreased
continuous
YRD
region.
Different
among
these
components
provides
unique
perspective
on
information
can
also
be
used
for
designing
effective
control
strategies
different
PM2.5.
Atmosphere,
Journal Year:
2024,
Volume and Issue:
15(2), P. 172 - 172
Published: Jan. 29, 2024
This
study
presents
an
approach
using
multiple
linear
regression
to
quantify
the
impact
of
meteorological
parameters
and
chemical
species
on
aerosol
pH
variance
in
urban
setting
Pearl
River
Delta,
China.
Additionally,
it
assesses
contributions
interactions
among
these
factors
pH.
The
analysis
successfully
explains
over
96%
variance,
attributing
85.8%
original
variables
6.7%
bivariate
interactions,
with
further
2.3%
1.0%
from
trivariate
quadrivariate
respectively.
Our
results
highlight
that
factors,
particularly
temperature
humidity,
are
more
influential
than
components
affecting
variance.
Temperature
alone
accounts
for
37.3%
while
humidity
contributes
approximately
20%.
On
front,
sulfate
ammonium
most
significant
contributors,
adding
14.3%
9.1%
In
realm
interplay
between
components,
especially
TNO3–RH
pair,
is
exceptionally
impactful,
constituting
58.1%
total
contribution
interactions.
summary,
this
illuminates
their
interplay,
suggesting
integration
statistical
methods
thermodynamic
models
enhanced
understanding
acidity
dynamics
future.
Atmospheric Environment,
Journal Year:
2024,
Volume and Issue:
334, P. 120712 - 120712
Published: July 24, 2024
Ambient
air
quality,
specifically
fine
particulate
matter
(PM2.5)
pollution,
poses
a
global
health
concern
due
to
its
associations
with
adverse
effects
and
persistent
presence
in
urban
settings.
This
study
investigates
PM2.5
exposure
traffic-influenced
residential
area
Vancouver,
employing
chemical
speciation
data
sampled
the
vicinity
of
major
road
throughout
2018.
Using
receptor-oriented
models,
Positive
Matrix
Factorization
(PMF),
Principal
Component
Analysis
(PCA),
emission
sources
contributing
total
mass
were
identified.
The
Organic
Elemental
carbon
concentration
time
series
analysis
reveals
impacts
from
traffic
episodic
influences
wildfires
heating.
Applying
PMF,
we
attribute
identified
factors
specific
sources:
(33%),
secondary
aerosols
(27%),
dust
(14%),
Marine
Heavy
Fuel
Combustion
(HFC)
(12%),
Local
(9%),
rare
metallic
elements
(5%),
respectively.
apportioning
is
subsequently
verified
by
PCA,
which
introduces
sea
salt
factor
analysis.
conditional
probability
function
on
integrated
wind
speed
direction,
PM
further
confirms
partial
apportionment
marine
HFC,
elements,
local
factors.
Lastly,
comparing
results
2015
inventory
Vancouver
shows
similarities
share
primary
while
overlooking
emissions
latter,
emphasizing
importance
field
sampling
for
accurate
source
characterization.
highlights
necessity
receptor
modeling
coupled
quantifying
contribution
characteristics
sources,
particularly
near
neighborhoods.
Precise
characterization
aids
studies
that
contribute
informed
quality
management
policy
regulations.
Heliyon,
Journal Year:
2025,
Volume and Issue:
11(2), P. e41812 - e41812
Published: Jan. 1, 2025
One
of
the
driest
countries
in
world,
Iran
has
been
facing
several
challenges
related
to
water
shortage,
leading
serious
social,
economic,
and
environmental
impacts.
Given
escalating
urbanization
industrial
development
within
Iran,
a
comprehensive
assessment
surface
quality
utilizing
both
US
National
Sanitation
Foundation
Water
Quality
Index
(NSFWQI)
for
(IRWQIsc)
is
imperative.
This
study
aimed
evaluate
Talar
River
Mazandaran,
2023,
through
IRWQIsc
NSFWQI.
was
conducted
River,
located
Mazandaran
Province
Iran.
samples
from
were
collected
assess
11
physicochemical
parameters
10
sampling
Points.
A
total
60
monthly
during
winter
summer
2023.
The
NSFWQI
selected
overall
River.
Nitrate
(NO3
-)
concentrations
ranged
29.32
85.89
mg/L
across
seasons,
with
average
values
falling
World
Health
Organization
(WHO)
standards.
Phosphate
(PO4
3-)
Chemical
Oxygen
Demand
(COD)
levels
exceeded
WHO
limits
on
occasion,
while
turbidity
electrical
conductivity
(EC)
consistently
surpassed
Environmental
Protection
Agency
(EPA)
guidelines.
pH
Biochemical
(BOD)
remained
acceptable
ranges.
indicated
generally
poor
all
sites,
slight
seasonal
variations
suggesting
slightly
better
conditions
indicates
that
NO3
-
PO4
3-
meet
limits,
but
COD,
turbidity,
EC
exceed
recommended
threshold.
highlight
resulting
agricultural
pollution.
Urgent
integrated
management
essential
mitigate
these
impacts
safeguard
river
health
face
pressures.
Atmospheric chemistry and physics,
Journal Year:
2025,
Volume and Issue:
25(7), P. 4211 - 4232
Published: April 14, 2025
Abstract.
Intensive
irrigation
is
known
to
alleviate
crop
water
stress
and
alter
regional
climate,
which
can
in
turn
influence
air
quality,
with
ramifications
for
human
health
food
security.
However,
the
interplay
between
irrigation,
climate
pollution
especially
simultaneously
intensively
irrigated
heavily
polluted
regions
China
has
rarely
been
studied.
Here
we
incorporated
a
dynamic
scheme
into
climate–air
quality
coupled
model
examine
potential
impacts
of
on
ozone
(O3)
fine
particulate
matter
(PM2.5)
China.
Results
show
that
increases
PM2.5
by
12
µg
m−3
(28
%)
but
reduces
O3
concentration
3–4
ppb
(6
%–8
%).
Among
PM2.5,
nitrate
ammonium
aerosols
rise
70
%
40
%,
respectively,
upon
introducing
secondary
formation
contributing
∼
60
10
%–30
respectively.
High
humidity
low
temperature
promote
aerosols.
To
mitigate
these
adverse
effects
found
20
reduction
NH3
NOx
emissions
more
effective
compared
individual
emission
reductions,
while
enhancement
due
be
completely
offset
itself.
Our
study
highlights
benefits
regarding
problems
under
currently
prevalent
modes
anthropogenic
scenarios,
emphasizing
need
an
integrated
approach
balance
conservation,
pollution,
change
mitigation
security
face
development
needs.
