Abstract.
On-road
vehicle
emissions
play
a
crucial
role
in
affecting
fine-scale
air
quality
and
exposure
equity
traffic-dense
urban
areas.
They
vary
largely
both
spatial
temporal
scales
due
to
the
complex
distribution
patterns
of
types
traffic
conditions.
With
deployment
cameras
big
data
approaches,
we
established
bottom-up
model
that
employed
interpolation
obtain
spatially
continuous
on-road
emission
mapping
for
main
area
Jinan,
revealing
gradients
hotspots
intuitively.
The
results
show
hourly
average
nitrogen
oxides,
carbon
monoxide,
hydrocarbons,
fine
particulate
matters
from
vehicles
Jinan
were
345.2,
789.7,
69.5,
5.4
kg,
respectively.
intensity
varied
with
factor
up
3
within
1
km
on
same
road
segment.
unique
further
examined
through
time
series
clustering
hotspot
analysis.
When
coincided
peak
hours,
significantly
enhanced,
making
them
key
targets
pollution
control.
Based
model,
predicted
benefits
electrification
reducing
could
reach
40
%–80
%.
Overall,
this
work
provides
new
methods
developing
high-resolution
inventory
areas,
offers
detailed
accurate
spatiotemporal
variation
which
are
great
implications
control,
management,
policy
making,
public
awareness
enhancement.
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 10, 2025
Vehicle
nitrogen
oxides
(NOx)
significantly
increase
dioxide
(NO2)
exposure
in
traffic-related
environments.
The
NO2/NOx
ratios
are
crucial
for
accurate
NO2
modeling
and
closely
linked
to
public
health
concerns.
In
2020,
we
used
a
mobile
platform
follow
test
trucks
(plume-chasing)
that
were
installed
with
portable
emission
measuring
system
(PEMS)
on
two
restricted
driving
tracts.
Six
hundred
eighteen
exhaust
plumes
collected
through
the
PEMS-chasing
measurements
from
seven
trucks.
NOx
factors
(EFs),
ratios,
calculated
at
distinct
stages
(i.e.,
tailpipe
on-road).
A
significant
reduction
EFs
(>64%)
was
observed
normal
operating
after-treatment
devices,
except
equipped
diesel
particulate
filter
(DPF).
Disparities
also
found,
attributed
technologies.
measured
plume-chasing
higher
(3–4
times,
p
<
0.001)
than
measurements,
providing
field
evidence
of
substantial
formation
plumes.
We
developed
quantitative
relationship
between
demonstrated
robust
correlation
(R2
>
0.90).
Since
plume
is
not
explicitly
accounted
modeling,
(O3–NO2/NOx)
could
improve
estimation
when
local
inventory
(tailpipe
emissions)
available.
The Science of The Total Environment,
Год журнала:
2024,
Номер
914, С. 169859 - 169859
Опубликована: Янв. 6, 2024
Vehicle
electrification
has
been
recognized
for
its
potential
to
reduce
emissions
of
air
pollutants
and
greenhouse
gases
in
China.
Several
studies
have
estimated
how
national-level
policies
electric
vehicle
(EV)
adoption
might
bring
very
large
environmental
public
health
benefits
from
improved
quality
However,
large-scale
is
costly,
some
regions
derive
more
EV
than
others,
the
replacing
internal
combustion
engines
specific
cities
are
less
known.
Therefore,
it
important
policymakers
design
incentives
based
on
regional
characteristics
-
especially
megacities
like
Shanghai
which
typically
suffer
worse
where
a
larger
population
exposed
vehicles.
Over
past
five
years,
offered
substantial
personal
subsidies
passenger
EVs
accelerate
efforts.
Still,
remains
uncertain
whether
justify
strength
incentives.
The
purpose
our
study
evaluate
climate
light-duty
gasoline
vehicles
(ICEVs)
with
battery
city
Shanghai.
We
assess
impacts
due
ICEV
primary
fine
particulate
matter,
NO
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(12), С. 5325 - 5335
Опубликована: Фев. 27, 2024
Upgrading
to
the
CHINA
7
standard
is
crucial
for
managing
air
pollution
from
passenger
vehicles
in
China.
Meanwhile,
China
aims
achieve
carbon
neutrality
by
2060,
which
necessitates
large-scale
replacement
of
gasoline
with
electric
future.
Consequently,
public
might
view
upgrading
as
redundant.
However,
emission
reduction
benefits
standards
context
uncertain
electrification
ambitions
have
not
received
adequate
attention.
Here,
we
show
that
will
compensate
absence
emissions
reductions
due
hindered
efforts.
In
best
scenario,
China's
CO2
can
be
reduced
0.047
Gt
and
NOx
8.2
×
103
t
2050.
nonextreme
scenarios
standard,
intensity
remain
main
driver
reductions,
outweighing
contribution.
extreme
scenarios,
tackle
increased
plug-in
hybrid
vehicles.
Our
fleet-level
results
advocate
early
upgrades
enhance
resilience
against
risks
arising
uncertainties
electrification.
evidence
China,
one
most
stringent
standards,
provide
a
reference
point
world
on
vehicle
issue.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(27), С. 12201 - 12211
Опубликована: Июнь 27, 2024
The
elevation
of
the
low-temperature
oxidation
activity
for
Pt/CeO2
catalysts
is
challenging
to
meet
increasingly
stringent
requirements
effectively
eliminating
carbon
monoxide
(CO)
from
automobile
exhaust.
Although
reducing
activation
a
facile
strategy
boosting
reactivity,
past
research
has
mainly
concentrated
on
applying
H2
as
reductant,
ignoring
reduction
capabilities
CO
itself,
prevalent
component
Herein,
atomically
dispersed
was
fabricated
and
activated
by
CO,
which
could
lower
90%
conversion
temperature
(T90)
256
°C
achieve
20-fold
higher
consumption
rate
at
200
°C.
showed
exceptional
catalytic
robust
hydrothermal
stability
under
simulated
working
conditions
gasoline
or
diesel
exhausts.
Characterization
results
illustrated
that
triggered
formation
large
portion
Pt0
terrace
sites,
acting
inherent
active
sites
oxidation.
Besides,
weakened
Pt–O–Ce
bond
strength
generate
surface
oxygen
vacancy
(Vo).
It
served
reservoir
store
dissociated
convert
it
into
dioxygen
intermediates.
Conversely,
failed
stimulate
Vo,
but
deactivating
transformation
Pt
nanocluster
inactive
PtxOy
in
presence
oxygen.
present
work
offers
coherent
insight
upsurging
effect
Pt/CeO2,
aiming
set
up
valuable
avenue
elevating
efficiency
C3H6,
NH3
Atmosphere,
Год журнала:
2024,
Номер
15(4), С. 417 - 417
Опубликована: Март 27, 2024
Vehicle
emissions
belong
to
the
category
of
near-surface
sources,
occur
close
human
activity
areas,
and
pose
a
greater
threat
health
than
other
anthropogenic
pollution
sources.
Furthermore,
study
spatiotemporal
characteristics
near-road
traffic
is
great
significance
urban
regional
ambient
air
quality
management,
also
an
important
basis
for
vehicle
emission
inventories,
as
well
assessment
impact.
Most
previous
studies
have
analyzed
hydrocarbons
(HCs),
carbon
monoxide
(CO),
nitrogen
oxides
(NOx),
dioxide
(CO2)
in
over
certain
time,
without
considering
synergistic
effect
mobile
source
particulate
matter,
NOx,
volatile
organic
compounds
(VOCs).
In
this
study,
we
analyze
composition
vehicles
with
different
standards
from
road
sources
Anqing
City,
China.
National
III
IV
are
main
contribution
various
pollutants,
accounting
more
60%
emissions.
Although
national
I
II
accounted
less
1%
total
number
vehicles,
their
cannot
be
ignored,
especially
CO
HCs,
which
such
can
reach
about
7%.
This
mainly
due
low
level
control
arising
larger
factor
age
these
vehicles.
eliminating
old
cars
increasing
proportion
VI
effectively
reduce
pollutant
terms
distribution
characteristics,
highways
around
areas
heavy
intensity
pollutants
higher
on
roads
surrounding
areas.
addition,
presence
m/p-xylene
toluene
solvent-using
species
detected,
indicates
that
petrol
emissions,
LPG
volatilization,
contribute
significantly
ozone
formation
process.
Comparing
weekdays
non-weekdays,
PM2.5
peaks
non-weekdays
those
weekdays,
there
no
“weekend
effect”,
little
influence
may
related
energy
use
industrial
pollution.
Overall,
strengthens
understanding
relationship
between
volumes,
types
spatial
temporal
scales,
emphasizes
need
further
investigation
comprehensive
measures
mitigate
Environmental Science & Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 1, 2024
Decarbonizing
road
transportation
is
an
important
task
in
achieving
China's
climate
goals.
Illustrating
the
mitigation
potentials
of
announced
policies
and
identifying
additional
strategies
for
various
vehicle
fleets
are
fundamental
optimizing
future
control
pathways.
Herein,
we
developed
a
comprehensive
analysis
carbon
dioxide
(CO
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(50), С. 21249 - 21259
Опубликована: Дек. 6, 2023
Fleet
electrification
shifts
emission
sources
from
the
tailpipe
to
electricity
generation
and
automotive
supply
chains
subsequently,
with
transfer
among
regions.
Such
a
spatial
cross-sectoral
of
air
pollutant
emissions
might
embody
uncertain
environmental
benefits
spatially,
which
has
not
been
comprehensively
quantified,
mainly
due
complexity
manufacturing
processes
electric
vehicle
(EV)
components
(e.g.,
battery).
We
developed
hybrid
life
cycle
assessment
by
combining
inventory
data
major
input-output
information
identified
how
China's
EV
deployment
would
influence
redistribution
currently
(2017)
in
future
(2030).
The
results
indicate
that
fleet
could
readily
reduce
nitrogen
oxides
(NOx)
nonmethane
volatile
organic
compound
(NMVOC)
12-93%,
reductions
are
estimated
be
concentrated
cities
urban
agglomerations.
However,
increased
demand
for
power
battery
production
increase
PM2.5
SO2
17-55%
grids
under
all
scenarios,
emerge
coal-rich
Inner
Mongolia,
Shanxi)
industrial
Shandong,
Henan,
Jiangsu)
provinces.
By
tracing
upstream,
31-55%
vehicle-cycle
deep
but
exhibit
diverse
sources.
It
suggests
necessity
relieve
leakage
synchronizing
effective
management
across
multiple
sectors
through
chains.
Atmosphere,
Год журнала:
2024,
Номер
15(2), С. 192 - 192
Опубликована: Фев. 1, 2024
Vehicle
emissions
have
become
a
significant
contributor
to
urban
air
pollution.
However,
studies
specific
city-level
vehicle
emission
inventories
are
still
scarce
and
tend
be
outdated.
This
study
introduces
methodology
for
developing
high-resolution
monthly
inventories.
We
applied
this
Changzhou
in
2022
analyze
characteristics
generate
gridded
data
with
resolution
of
0.01°
×
0.01°.
The
results
show
that
the
total
carbon
monoxide
(CO),
volatile
organic
compounds
(VOCs),
nitrogen
oxides
(NOx),
fine
particulate
matters
(PM2.5)
39.69,
8.68,
18.6,
0.56
Gg,
respectively.
Light-duty
passenger
vehicles
main
contributors
CO
(74.3%)
VOCs
(86.1%)
emissions,
while
heavy-duty
trucks
play
role
NOx
(50.7%)
PM2.5
(34.7%)
emissions.
Gasoline
mainly
responsible
(78.6%)
(91.4%)
diesel
primary
source
(81.1%)
(70.6%)
Notably,
China
IV
highest
contribution
rates
(ranging
from
32.5%
44.9%).
Seasonally,
peak
winter
lowest
April.
Spatially,
intensity
is
higher
northeast
compared
west
south.
presented
offers
valuable
tool
comprehensive
inventories,
provide
critical
insights
can
inform
formulation
effective
environmental
policies.
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 12, 2025
The
relationship
between
the
socioeconomic
status
(SES)
and
PM2.5
exposure
is
rather
inconclusive.
We
employed
taxi-based
measurements
with
30
m
resolution
to
characterize
local
source
contribution
(PM2.5
adjusted
concentration)
discerned
for
2019
winter
2020
summer,
in
Xi'an.
A
big
data
set
comprising
∼6
×
106
hourly
SES
from
∼5000
communities
was
utilized
examine
inequalities
community-level
exposure.
Our
results
indicate
that
inhabitants
lower
are
more
likely
be
disproportionately
exposed
compared
those
higher
SES.
At
least
92%
of
rural
regions
reside
low
areas,
whereas
a
relatively
smaller
proportion
(69–78%)
urban
regions.
has
profound
impact
on
during
summer
than
winter.
polluted
areas
concentration
accounted
22%
26%
total
However,
residing
low-concentration
contributed
only
12%
while
30%.
These
findings
provide
valuable
insights
into
SES,
highlighting
need
sophisticated
air
quality
policies
alleviate