Atmosphere,
Journal Year:
2023,
Volume and Issue:
14(12), P. 1799 - 1799
Published: Dec. 8, 2023
PM2.5
pollution
over
Hangzhou
Bay
area,
China
has
received
continuous
attention.
In
this
study,
samples
were
collected
simultaneously
in
six
typical
cities
Zhejiang
Province
from
15
October
2019
to
January
2020
(autumn
and
winter)
1
June
31
August
(summer),
major
water-soluble
ions
analyzed.
Average
concentrations
of
NO3−
SO42−
the
3.93–15.64
μg/m3
4.61–7.58
autumn
winter,
with
mass
fractions
up
19.6–34.2%
13.6–26.3%,
respectively,
while
summer,
they
1.23–2.64
2.22–4.14
μg/m3,
7.0–15.0%
14.7~25.1%.
Both
mostly
gas-to-particle
transformation
precursors.
High
relative
humidity
was
suggested
significantly
promote
formation
SO42−,
particularly
enhanced
atmospheric
oxidation
favored
summer.
However,
inhibited
under
a
high
temperature
>15
°C.
The
NO3
correlated
each
other
among
cities.
Potential
source
contribution
function
analysis
indicated
that
both
local
area
also
transported
Shanghai
southern
region
Jiangsu
Province.
This
study
contributed
understanding
regional
characteristics
joint
prevention
control
efforts
should
be
strengthened
reduce
pollution.
Advances in Atmospheric Sciences,
Journal Year:
2023,
Volume and Issue:
40(8), P. 1339 - 1361
Published: April 28, 2023
Atmospheric
chemistry
research
has
been
growing
rapidly
in
China
the
last
25
years
since
concept
of
"air
pollution
complex"
was
first
proposed
by
Professor
Xiaoyan
TANG
1997.
For
papers
published
2021
on
air
(only
included
Web
Science
Core
Collection
database
were
considered),
more
than
24
000
authored
or
co-authored
scientists
working
China.
In
this
paper,
we
review
a
limited
number
representative
and
significant
studies
atmospheric
few
years,
including
(1)
sources
emission
inventories,
(2)
chemical
processes,
(3)
interactions
with
meteorology,
weather
climate,
(4)
between
biosphere
atmosphere,
(5)
data
assimilation.
The
intention
not
to
provide
complete
all
progress
made
but
rather
serve
as
starting
point
for
learning
about
advances
reviewed
paper
have
enabled
theoretical
framework
complex
be
established,
provided
robust
scientific
support
highly
successful
control
policies
China,
created
great
opportunities
education,
training,
career
development
many
graduate
students
young
scientists.
This
further
highlights
that
developing
low-income
countries
are
heavily
affected
can
benefit
from
these
advances,
whilst
at
same
time
acknowledging
challenges
still
remain
hopefully
addressed
over
next
decades.
Environment International,
Journal Year:
2025,
Volume and Issue:
196, P. 109317 - 109317
Published: Feb. 1, 2025
Stable
nitrogen
isotopic
composition
(δ15N)
has
proven
to
be
a
valuable
tool
for
identifying
sources
of
nitrates
(NO3-)
in
PM2.5.
However,
the
absence
systematic
study
on
δ15N
values
domestic
NOx
hinders
accurate
identification
NO3-
China.
Here,
we
systematically
determined
and
refined
six
categories
Tianjin
using
an
active
sampling
method.
Moreover,
PM2.5
were
measured
during
pre-heating,
mid-heating
late-heating
periods,
which
are
most
heavily
polluted
Tianjin.
The
results
indicate
that
fingerprints
types
indicative
regional
characteristics
China,
particularly
North
China
Plain.
Bayesian
isotope
mixing
(MixSIAR)
model
demonstrated
coal
combustion,
biomass
burning,
vehicle
exhaust
collectively
contributed
more
than
60
%,
dominating
periods
failure
consider
signatures
local
could
result
overestimation
contribution
from
natural
gas
combustion.
Additionally,
industrial
sources,
uncharacterized
source
previous
studies,
may
directly
fraction
other
being
overestimated
by
10
%.
Notably,
as
number
input
increased,
various
was
becoming
stable,
inter-influence
between
significantly
reduced.
This
fingerprint
effectively
distinguish
NO3-,
thereby
providing
insights
controlling
pollution.
Atmospheric chemistry and physics,
Journal Year:
2022,
Volume and Issue:
22(18), P. 12629 - 12646
Published: Sept. 28, 2022
Abstract.
Nitrate
(NO3−)
has
been
the
dominant
and
least
reduced
chemical
component
of
fine
particulate
matter
(PM2.5)
since
stringent
emission
controls
implemented
in
China
2013.
The
formation
pathways
NO3−
vary
seasonally
differ
substantially
daytime
vs.
nighttime.
They
are
affected
by
precursor
emissions,
atmospheric
oxidation
capacity,
meteorological
conditions.
Understanding
provides
insights
for
design
effective
control
strategies
to
mitigate
pollution.
In
this
study,
Community
Multiscale
Air
Quality
(CMAQ)
model
was
applied
investigate
impact
regional
transport,
predominant
physical
processes,
different
total
nitrate
(TNO3,
i.e.,
HNO3+
NO3−)
production
Yangtze
River
Delta
(YRD)
region
during
four
seasons
2017.
NO3-/PM2.5
NO3-/TNO3
highest
winter,
reaching
21
%
94
%,
respectively.
adjusted
gas
ratio
(adjGR
=
([NH3]+
[NO3−])/([HNO3]+
[NO3−]))
YRD
is
generally
greater
than
2
across
most
areas
YRD,
indicating
that
mostly
NH3-rich
regime
limited
HNO3
formation.
Local
emissions
transportation
contribute
concentrations
throughout
50
%–62
38
%–50
majority
transport
contributed
indirect
(i.e.,
formed
transported
precursors
reacting
with
local
precursors).
Aerosol
(AERO,
including
condensation,
coagulation,
new
particle
formation,
aerosol
growth)
processes
source
summer,
dominated
AERO
(TRAN,
sum
horizontal
vertical
transport)
processes.
OH
+
NO2
pathway
contributes
60
%–83
TNO3
production,
N2O5
heterogeneous
(HET
N2O5)
10
%–36
region.
HET
contribution
becomes
more
important
cold
warm
seasons.
Within
planetary
boundary
layer
Shanghai,
day
(98
%)
summer
spring
night
(61
winter.
contributions
dominate
day,
while
dominates
at
night.
Atmospheric chemistry and physics,
Journal Year:
2024,
Volume and Issue:
24(5), P. 2803 - 2820
Published: March 4, 2024
Abstract.
Despite
significant
improvements
in
air
quality
recent
years,
the
Sichuan
Basin
(SCB)
is
still
facing
frequent
haze
pollution
winter,
and
causes
of
severe
formation
have
not
yet
been
fully
investigated.
In
this
study,
chemical
components
PM2.5
(i.e.,
particulate
matter
with
an
aerodynamic
diameter
less
than
2.5
µm)
a
typical
period
at
beginning
2023
Chengdu,
megacity
SCB,
were
characterized
by
bulk-chemical
single-particle
analysis,
sources
mechanism
analyzed.
The
average
mass
concentration
during
study
was
95.6
±
28.7
µg
m−3.
Organic
(OM)
most
abundant
component
(35.3
%),
followed
nitrate
(22.0
sulfate
(9.2
%)
ammonium
(7.8
%).
individual
aerosol
particles
classified
into
five
categories,
i.e.,
mineral,
OM,
secondary
inorganic
(SIA),
soot
fly
ash/metal
particles,
them
state
being
internally
mixed.
entire
observation
could
be
divided
two
non-pollution
periods
(NP-1
NP-2)
(Haze-1
Haze-2).
With
evolution
pollution,
analysis
exhibited
similar
characteristics,
suggesting
that
Haze-1
mainly
caused
pollutants
related
to
fossil
fuel
combustion,
especially
local
mobile
sources,
while
Haze-2
triggered
rapidly
increasing
pollutants,
which
came
from
regional
transmission.
included
dust
(8.5
biomass
burning
(3.5
coal
combustion
(15.4
industrial
processes
(6.5
vehicular
emissions
(25.6
(40.5
Analysis
Weather
Research
Forecasting
model
Chemistry
(WRF-Chem)
results
showed
contributions
transmission
Chengdu
same
(50
%
vs.
50
addition,
source
composition
WRF-Chem
simulation
different
confirmed
our
mechanisms
events.
This
confirms
further
reductions
are
needed,
more
effective
policies
for
emission
reduction
or
joint
prevention
control
will
necessary
future.
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.
