Long-range
transport
(LRT)
channels/routes
of
air
masses
in
East
Asia
and
their
impacts
on
PM2.5
concentrations
at
three
remote
sites
were
explored.
We
identified
six
routes
(A-F)
classified
them
into
main
channels
(i.e.
East,
West,
South
Channels)
based
potential
sources.
During
the
sampling
periods,
Green
Island
(Site
GR)
Hengchun
Peninsula
HC)
exhibited
similarities
routes,
with
Central
China,
North
Korean
being
major
source
regions
PM2.5,
particularly
during
Asian
Northeastern
Monsoons
(ANMs).
Dongsha
DS)
was
influenced
by
both
China
coastal
indicating
continental
outflow
(ACO)
as
PM2.5.
Chemical
analysis
revealed
that
soil
dust,
sea
salts,
biomass
burning,
ship
emissions,
secondary
aerosols
Northerly
Channels
West
primarily
while
Channel
dominated
oceanic
spray,
emissions.
further
conducted
a
W-PSCF
categorizing
four
levels
(0-25%,
25-50%,
50-75%,
75-100%).
Three
experienced
significant
contributions
from
highest
concentration
range
(75-100%).
In
contrast,
0-25%
25-50%
ranges
originated
open
seas,
emissions
prominent
source.
It
suggested
northern
heavy
industrialization
urbanization
have
high
concentrations,
seas
are
sources
low
concentrations.
Environmental Research Letters,
Journal Year:
2024,
Volume and Issue:
19(7), P. 073007 - 073007
Published: May 13, 2024
Abstract
Air
pollution
is
the
most
difficult
challenge
India
facing
today,
and
anthropogenic
biomass
burning
(ABB)
one
of
major
least
understood
sources,
leading
to
serious
health
climate
implications
by
affecting
air
quality,
visibility,
atmospheric
chemistry,
Earth’s
radiation
budget
biogeochemical
cycling.
Scientific
understanding
composition,
chemistry
regional
dynamics
(BB)
emissions
still
limited,
thus
constraining
implementation
appropriate
research
policy
interventions.
The
broad
categories,
associated
complex
spatio-temporal
variations
ABB
in
are
discussed
here.
Major
types
that
prevalent
year-round
all
over
include
BB
for
cooking,
heating
purposes
open
waste
burning.
Moreover,
crop
residue
(CRB)
Indo-Gangetic
plain
(IGP)
during
pre-
(April–May)
post-monsoon
(October–November)
seasons,
CRB
South
January–February,
forest
fires
Central
slash-and-burn
agriculture
Northeast
March–May
other
dominant
sources
active
specific
months
regions.
Over
IGP,
along
with
episodic
events
stagnant
meteorology
result
severe
quality
poor
visibility
(<∼300
m)
reported
daily
mean
PM
2.5
concentrations
shooting
up
15
times
higher
than
Pollution
Control
Board
standards.
When
compared
wheat
burning,
fire
counts
paddy
events.
During
winters,
BB’s
contribution
37%
aerosol
oxidative
potential
Delhi
indicates
its
implications.
Meta-analysis
data
obtained
from
representative
source
apportionment
studies
on
10
shows
>24%
Assam,
Ahmedabad,
Kanpur
Visakhapatnam,
20%–24%
Patiala
Kolkata,
10%–14%
Delhi.
With
regard
,
contributions
Ahmedabad
Agra,
15%–19%
Delhi,
Mumbai
Kolkata
reported,
while
1
contributed
19%–24%
Kanpur,
Assam
<10%
Observed
composition
call
region-specific
solutions
through
airshed-based
management.
Atmospheric chemistry and physics,
Journal Year:
2025,
Volume and Issue:
25(7), P. 3919 - 3928
Published: April 8, 2025
Abstract.
Aerosol
acidity
(or
pH)
plays
a
crucial
role
in
atmospheric
chemistry,
influencing
the
interaction
of
air
pollutants
with
ecosystems
and
climate.
pH
shows
large
temporal
variations,
while
driving
factors
chemical
profiles
versus
meteorological
conditions
are
not
fully
understood
due
to
their
intrinsic
complexity.
Here,
we
propose
new
framework
quantify
factor
importance,
which
incorporated
an
interpretive
structural
modeling
(ISM)
approach
time
series
analysis.
In
particular,
hierarchical
relationship
is
established
based
on
multiphase
buffer
theory
ISM.
A
long-term
(2018–2023)
observation
dataset
Changzhou,
China,
analyzed
this
framework.
We
found
variation
dominated
by
seasonal
random
trend
varies
little
despite
emission
changes.
This
overall
effect
decreasing
PM2.5,
increasing
temperature
increased
alkali-to-acid
ratios.
Temperature
controlling
through
effective
acid
dissociation
constant
Ka∗,
non-ideality
cni
gas–particle
partitioning.
Random
variations
aerosol
water
contents
Ka∗
cni.
provides
quantitative
understanding
at
different
levels,
important
acidity-related
process
studies
policy-making.
Journal of Geophysical Research Atmospheres,
Journal Year:
2025,
Volume and Issue:
130(8)
Published: April 11, 2025
Abstract
Quantifying
atmospheric
degradation
of
levoglucosan,
a
highly
specific
molecular
marker
for
biomass
burning
(BB)
aerosols,
is
essential
in
assessing
impacts
BB
on
air
quality
and
climate.
However,
the
stability
levoglucosan
atmosphere
has
only
been
evaluated
through
laboratory
experiments
or
model
simulations.
Here,
we
investigated
its
two
co‐emitting
isomers,
mannosan
galactosan,
utilizing
bihourly
measurement
data
at
suburban
site
Hong
Kong
over
period
4
months.
The
concentrations
three
saccharides,
upon
normalization
by
BB‐derived
potassium,
displayed
distinct
consistent
depletion
during
daytime
hours
from
08:00
to
16:00,
which
follows
an
exponential
decay
pattern.
We
calculated
individual
rate
constants
saccharides
their
day‐by‐day
kinetics.
rates
galactosan
were
34%
40%
higher
than
that
levoglucosan.
estimated
lifetime
was
13
±
7
hr,
ranging
3
46
hr
under
condition
temperature
22
5°C,
relative
humidity
55
14%.
This
work
provides
first
kinetic
derived
real
ambient
measurements.
They
are
valuable
refining
predictions
concerning
aerosol
local,
regional,
global
scales.
IntechOpen eBooks,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 22, 2025
The
chemical
characteristics,
spatiotemporal
variation,
and
source
apportionment
of
PM2.5
emitted
from
ship
exhausts
in
Kaohsiung
Harbor
its
impact
on
Metro
are
investigated.
highest
concentrations
were
observed
winter,
followed
by
fall,
spring,
summer,
primarily
driven
poor
dispersion
conditions
during
the
Northeastern
Monsoon.
Chemical
analysis
revealed
that
is
dominated
water-soluble
ions
(WSIs),
particularly
secondary
inorganic
aerosols
(SIAs).
Crustal
elements
such
as
Mg,
Al,
Ca
dominate
metallic
content
PM2.5,
while
elevated
V/Ni
ratios
highlighted
contribution
emissions,
summer.
Ship
emissions
including
main
auxiliary
engines
played
a
crucial
role
levels.
Main
contributed
2.9–5.3%
Kaohsiung,
shorter
navigation
periods,
whereas
3.8–8.3%
longer
berthing
periods.
disparity
between
engine
contributions
reflects
their
operational
differences,
with
producing
sustained
exacerbate
urban
air
quality
impacts.
was
closely
correlated
harbor
indicating
strong
port-urban
interactions.
Higher
SO42−
areas
linked
to
industrial
mobile
sources
influenced
PM2.5.
Secondary
organic
(SOAs)
long-range
transport
local
photochemical
reactions
further
contribute
worsened
high
atmospheric
stability
low
mixing
layer
heights.
Sea
breezes
harbor-originated
toward
inland,
summer
amplifying
maritime
through
solar
radiation
thermal
convection,
leading
intensified
degradation.
Remote Sensing,
Journal Year:
2024,
Volume and Issue:
16(11), P. 1907 - 1907
Published: May 25, 2024
Carbon
satellites
are
an
important
observation
tool
for
analyzing
ground
carbon
emission.
From
the
perspective
of
Earth’s
scale,
spatiotemporal
sparse
characteristics
raw
data
observed
from
satellite
requires
accurate
interpolation
data,
and
based
on
only
this
work,
people
predict
future
emission
trends
formulate
appropriate
management
conservation
strategies.
The
existing
research
work
has
not
fully
considered
close
correlation
between
seasons,
as
well
accumulated
over
a
long
time
scale.
In
paper,
firstly,
by
employing
extreme
random
forests
auxiliary
we
reconstruct
daily
average
CO2
dataset
at
resolution
0.25°,
achieve
validated
determination
coefficient
0.92.
Secondly,
introducing
technologies
such
Time
Convolutional
Networks
(TCN),
Channel
Attention
Mechanism
(CAM),
Long
Short-Term
Memory
networks
(LSTM),
conduct
atmospheric
concentration
predictions.
When
conducting
predictive
analysis
Yangtze
River
Delta
region,
train
model
using
quarterly
2016
to
2020;
in
summer
is
0.94,
winter
it
0.91.
These
experimental
indicate
that
compared
other
algorithms,
algorithm
significantly
better
performance.
