Environmental Engineering Research,
Journal Year:
2023,
Volume and Issue:
29(4), P. 230475 - 0
Published: Nov. 8, 2023
The
air
pollution
process
and
impact
mechanism
of
megacities
located
in
complex
terrain
are
particularly
complex.
As
a
typical
megacity
China,
Chengdu
has
unique
topographical
meteorological
conditions,
its
control
is
difficult.
This
study
systematically
elucidated
the
variation
characteristics
six
criteria
pollutants
between
2014
2020.
Besides,
PM<sub>2.5</sub>/PM<sub>10</sub>
NO<sub>2</sub>/SO<sub>2</sub>
ratios
were
discussed.
Furthermore,
detailed
analysis
correlation
was
carried
out.
Finally,
collaborative
path
carbon
reduction
results
indicated
that
SO<sub>2</sub>,
PM<sub>2.5</sub>,
PM<sub>10</sub>
CO
significantly
decreased
by
62.9%,
50.8%,
45.5%,
36.7%,
respectively.
PM<sub>2.5</sub>
O<sub>3</sub>
compliance
rates
very
low,
increases
with
fluctuations.
NO<sub>2</sub>,
CO,
PM
showed
“U-shaped”
seasonal
variation,
there
“seesaw”
phenomenon
PM<sub>2.5</sub>.
continuous
changing
trends
also
found
NO<sub>2</sub>/SO<sub>2</sub>.
highlight
importance
coordinated
emissions
Chengdu.
research
can
improve
prediction
accuracy
areas
under
global
warming,
understanding
formation
special
terrains
around
world.
Frontiers in Environmental Science,
Journal Year:
2025,
Volume and Issue:
13
Published: March 21, 2025
Introduction
The
rapid
urbanization
and
industrialization,
accompanied
by
high-intensive
population,
energy
consumption
transportation
activities,
have
made
air
pollution
an
intractable
environmental
issue
in
China,
especially
most
megacities.
This
study
identified
the
primary
pollutant
(PAP)
of
a
Chinese
megacity—Chengdu,
analyzed
spatiotemporal
changes
PAP
concentrations.
Methods
LMDI
GWR
models
were
employed
to
probe
drivers
Chengdu.
Results
discussion
pollutants
PM
10
,
2.5
O
3
NO
2
as
PAPs
During
period
2015∼2021,
concentrations
four
showed
decreasing
trends
from
90.5
μg/m
56.7
90.0
34.0
54.2
33.7
87.0
29.1
respectively.
In
2021,
spatial
distributions
characterized
being
higher
central
areas.
temporal
conjointly
influenced
per
capita
GDP,
urban
built-up
area
unit
greenery
coverage
rate,
load
intensity
greenery,
with
positive
effects
rate
negative
GDP
greenery.
spatial,
geographical
factors
(including
temperature,
precipitation,
wind
speed,
cultivated
vegetation
rate)
socio-economic
both
affected
However,
there
heterogeneities
driving
forces
between
different
districts
Chengdu,
due
disparities
context
also
highlights
possible
policy
implications
for
alleviating
pollution,
provides
scientific
insights
building
clean
livable
environments
cities.
Journal of the Air & Waste Management Association,
Journal Year:
2023,
Volume and Issue:
73(9), P. 649 - 678
Published: July 14, 2023
Clarifying
the
spatiotemporal
distribution
and
impact
mechanism
of
pollution
is
prerequisite
for
megacities
to
formulate
relevant
air
prevention
control
measures
achieve
carbon
neutrality
goals.
Chongqing
one
dual-core
key
in
Cheng-Yu
region
as
a
typical
mountain-city
China,
environmental
problems
are
complex
sensitive.
This
research
aims
investigate
exceeding
standard
levels
spatio-temporal
evolution
criteria
pollutants
between
2014
2020.
The
results
indicated
that
PM10,
PM2.5,
CO
SO2
were
decreased
significantly
by
45.91%,
52.86%,
38.89%
66.67%,
respectively.
Conversely,
concentration
pollutant
O3
present
fluctuating
growth
found
"seesaw"
phenomenon
it
PM.
Furthermore,
PM
highest
winter
summer,
SO2,
NO2,
CO,
showed
"U-shaped",
an
inverted
"U-shaped"
seasonal
variation.
concentrations
still
far
behind
WHO,
2021AQGs
standards.
Significant
spatial
heterogeneity
was
observed
distribution.
These
great
significance
"double
double
reduction"
PM2.5
pollution,
regional
peaking
roadmap
under
climate
coordination.
Besides,
can
provide
important
platform
exploring
terrain
around
world
references
related
epidemiological
research.Implication:
mountain
city,
Under
background
"14th
Five-Year
Plan",
construction
"Cheng-Yu
Dual-City
Economic
Circle"
"Dual-Carbon"
goal,
this
article
comprehensively
discussed
annual
excess
multiple
policy
newest
international
standards
(WHO,2021AQG)
backgrounds
from
2020
Chongqing.
suggestions
collaborative
management
discussed.
Finally,
limitations
recommendations
also
put
forward.Clarifying
cities
study
coordination
action
plan
sustained
improvement
quality.In
addition,
advanced
our
understanding
terrain.
promote
China
national
strategic
economic
circle
build
beautiful
west.
Moreover,
provides
scientific
insights
local
policymakers
guide
smart
urban
planning,
industrial
layout,
energy
structure,
transportation
planning
improve
quality
throughout
region.
conducive
future
other
regions
even
with
world.
Social Science Humanities and Sustainability Research,
Journal Year:
2023,
Volume and Issue:
4(3), P. p118 - p118
Published: June 20, 2023
Regional
differences
and
development
heterogeneity
lead
to
an
unbalanced
distribution
of
heavy
industry
in
Chengdu-Chongqing
region
China.
Under
the
background
low-carbon
development,
clarifying
constraint
mechanism
environmental
regulations
on
carbon
emissions
becomes
more
important
solve
prominent
problems
resources
environment.
In
this
work,
literature
analysis,
comparative
analysis
statistical
induction
are
carried
out
illustrate
a
regulation
emission.
Based
reports
government
yearbook
data,
impacts
studied.
Analysis
demonstration
from
four
dimensions:
corporate
identity,
technological
progress,
policy
constraints,
supervision.
The
predicament
affecting
emission
reduction
is
expounded
puts
forward
reasonable
suggestions.
research
results
can
enrich
theory
regulation,
provide
suggestions
for
optimizing
green
transformation
industry.
Sustainability,
Journal Year:
2024,
Volume and Issue:
16(14), P. 6131 - 6131
Published: July 18, 2024
Urban
air
pollution
is
a
critical
global
environmental
issue,
necessitating
an
analysis
of
the
spatiotemporal
characteristics
quality
and
its
driving
factors
for
sustainable
urban
development.
However,
traditional
assessment
system
ignores
impact
internal
spatial
structures.
Therefore,
this
paper
proposes
that
integrates
natural,
socio-economic,
layout
by
utilizing
index
(AQI)
14
types
multi-source
geographic
data
in
main
area
Beijing
from
2016
to
2020
constructs
geographically
weighted
regression
(GWR)
multi-scale
(MGWR)
models
analysis.
Our
findings
revealed
annual
improvement
quality,
with
U-shaped
seasonal
pattern
significant
clustering
(Global
Moran’s
I
=
0.922).
The
MGWR
model
provided
superior
fit
over
GWR,
capturing
variability
more
effectively.
Variables
such
as
NDVI,
economic
output
(GDP),
humidity
space
adjustment
capability
(HSAC)
showed
positive
impacts
on
while
population
density
(POP),
temperature
(TEMP),
road
(RD)
exhibited
negative
effects.
These
results
explain
changes
perspective
provide
planning
input
regulations.
