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.
Atmospheric chemistry and physics,
Journal Year:
2025,
Volume and Issue:
25(6), P. 3389 - 3412
Published: March 20, 2025
Abstract.
The
hygroscopicity
and
volatility
of
submicron
ambient
aerosol
particles
with
diameters
50,
80,
110,
150
nm
the
their
non-volatile
cores
were
measured
using
a
tandem
differential
mobility
analyzer
(VH-TDMA)
system
at
relative
humidity
90
%
thermal
denuder
temperature
270
°C
from
11
October
to
6
November
2023
in
Beijing.
mean
hygroscopic
growth
factor
(HGF)
for
100,
diameter
was
1.15
±
0.07,
1.24
0.08,
1.30
0.09,
1.36
0.10,
respectively,
while
volatile
shrink
(VSF)
0.51
0.05,
0.55
0.04,
0.56
respectively.
Both
HGF
probability
density
function
(HGF
PDF)
VSF
(VSF
all
selected
particle
sizes
exhibited
pronounced
bimodal
distribution,
indicating
that
primarily
an
external
mixing
state.
Hygroscopicity
observed
increase
size
both
clean
pollution
periods,
decreased
slightly
during
period,
without
apparent
trend
period.
A
positive
correlation
identified
between
volatility,
as
well
number
fraction
nearly
hydrophobic
(NH)
(NV)
particles.
Furthermore,
this
study
core
(HGFcore)
heated
derived
coating
(HGFcoating).
HGFcoating
1.17
1.27
1.35
1.41
which
is
2
7
higher
than
same
sizes.
HGFcore
1.08
0.03,
1.07
1.09
values
increased
when
air
mass
passed
over
or
originated
Bohai
Sea.
Environmental Pollution,
Journal Year:
2024,
Volume and Issue:
355, P. 124175 - 124175
Published: May 16, 2024
High
uncertainty
in
optical
properties
of
black
carbon
(BC)
involving
heterogeneous
chemistry
has
recently
attracted
increasing
attention
the
field
atmospheric
climatology.
To
fill
gap
BC
knowledge
so
as
to
estimate
more
accurate
climate
effects
and
serve
response
global
warming,
it
is
beneficial
conduct
site-level
studies
on
light
absorption
enhancement
(Eabs)
characteristics.
Real-time
surface
gas
particulate
pollutant
observations
during
summer
winter
over
Wuhan
were
utilized
for
analysis
Eabs
simulated
by
minimum
R
square
(MRS),
considering
two
distinct
conditions
(2015
2017).
In
general,
differences
aerosol
emissions
led
differential
behaviors.
The
average
(1.92
±
0.55)
2015
was
higher
than
(1.27
0.42),
while
(1.11
0.20)
2017
lower
that
(1.67
0.69)
winter.
RBC
(representing
mass
ratio
non-refractory
constituents
elemental
carbon)
constraints
suggest
increased
with
increase
under
ambient
condition
enriched
secondary
inorganic
(SIA),
a
maximum
growth
rate
70.6%
summer.
However,
demonstrated
negative
trend
against
due
complicated
mixing
state.
result
arose
from
opposite
impact
hygroscopic
SIA
absorbing
OC/irregular
distributed
coatings
amplifying
absorbency
BC.
Furthermore,
sensitivity
revealed
robust
positive
correlation
(R
>
0.9)
between
chemical
compositions
(including
sulfate,
nitrate,
ammonium
organic
carbon),
which
could
be
significantly
perturbed
only
small
fraction
materials
or
restructuring
through
gaps
filling.
above
findings
not
deepen
understanding
BC,
but
also
provide
useful
information
scientific
decision-making
government
mitigate
pollution
obtain
precise
radiative
forcing.
Atmosphere,
Journal Year:
2024,
Volume and Issue:
15(8), P. 1004 - 1004
Published: Aug. 20, 2024
Aerosol
acidity
is
a
critical
factor
affecting
atmospheric
chemistry.
Here,
we
present
study
on
annual,
monthly,
and
daily
variations
in
PM2.5
pH
Shanghai
during
2010–2020.
With
the
effective
control
of
SO2
emissions,
NO2/SO2
ratio
increased
from
1.26
2010
to
5.07
2020
NO3−/SO42−
0.68
1.49.
decreased
3.27
2.93
2020,
regardless
great
achievement
reducing
industrial
NOx
emissions.
These
findings
suggest
that
aerosol
might
not
be
significantly
reduced
response
The
monthly
variation
values
exhibited
V-shape
trend,
mainly
attributable
compositions
temperature.
Atmospheric
NH3
plays
decisive
role
buffering
particle
acidity,
whereas
Ca2+
K+
are
important
buffers,
distinct
decline
2010–2016
was
associated
with
reduction
while
both
temperature
SO42−
were
drivers
winter.
Sensitivity
tests
show
increases
increasing
relative
humidity
summer
it
sensitive
winter
due
proportional
Hair+
liquid
water
content
(ALWC).
Our
results
emissions
will
affect
