Environmental Science & Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 20, 2024
Accurate
estimation
of
atmospheric
chemical
concentrations
from
multiple
observations
is
crucial
for
assessing
the
health
effects
air
pollution.
However,
existing
methods
are
limited
by
imbalanced
samples
observations.
Here,
we
introduce
a
novel
deep-learning
model-measurement
fusion
method
(DeepMMF)
constrained
physical
laws
inferred
transport
model
(CTM)
to
estimate
NO2
over
Continental
United
States
(CONUS).
By
pretraining
with
spatiotemporally
complete
CTM
simulations,
fine-tuning
satellite
and
ground
measurements,
employing
optimization
strategy
selecting
proper
prior
emission,
DeepMMF
delivers
improved
estimates,
showing
greater
consistency
daily
variation
alignment
(with
NMB
reduced
−0.3
−0.1
compared
original
simulations).
More
importantly,
effectively
addressed
sample
imbalance
issue
that
causes
overestimation
(by
100%)
downwind
or
rural
in
other
methods.
It
achieves
higher
R2
0.98
lower
RMSE
1.45
ppb
surface
observations,
overperforming
approaches,
which
show
values
0.4–0.7
RMSEs
3–6
ppb.
The
also
offers
synergistic
advantage
adjusting
corresponding
emissions,
agreement
changes
(−10%
−20%)
reported
NEI
between
2019
2020.
Our
results
demonstrate
great
potential
data
better
support
pollution
exposure
forecasting.
Remote Sensing,
Год журнала:
2025,
Номер
17(2), С. 200 - 200
Опубликована: Янв. 8, 2025
Anthropogenic
heat
is
the
generated
by
human
activities
such
as
industry,
construction,
transport,
and
metabolism.
Accurate
estimates
of
anthropogenic
are
essential
for
studying
impacts
on
climate
atmospheric
environment.
Commonly
applied
methods
estimating
include
inventory
method,
energy
balance
equation
building
model
simulation
method.
In
recent
years,
rapid
development
computer
technology
availability
massive
data
have
made
machine
learning
a
powerful
tool
fluxes
assessing
its
effects.
Multi-source
remote
sensing
also
been
widely
used
to
obtain
more
details
spatial
temporal
distribution
characteristics
heat.
This
paper
reviews
main
approaches
emissions.
The
typical
algorithms
abovementioned
three
introduced,
their
advantages
limitations
evaluated.
Moreover,
progress
in
application
discussed
well.
Based
big
techniques,
research
feature
engineering
fusion
will
bring
about
major
changes
analysis
modeling
More
in-depth
this
issue
recommended
provide
important
support
curbing
global
warming,
mitigating
air
pollution,
achieving
national
goals
carbon
peak
neutrality
strategy.
Environment International,
Год журнала:
2025,
Номер
unknown, С. 109304 - 109304
Опубликована: Янв. 1, 2025
Improvements
in
computer
processing
power
are
facilitating
the
development
of
more
detailed
environmental
models
with
greater
geographical
coverage.
We
developed
a
national-scale
model
outdoor
air
pollution
(Hybrid
Air
Dispersion
Exposure
System
-
HADES)
for
rapid
production
concentration
maps
nitrogen
dioxide
(NO2)
and
ozone
(O3)
at
very
high
spatial
resolution
(10m).
The
combines
dispersion
modelling
satellite-derived
estimates
background
concentrations,
land
cover,
3-D
representation
buildings,
statistical
calibration
framework.
an
emissions
inventory
covering
England
Wales
to
implement
tested
its
performance
using
data
years
2018-2019
from
fixed-site
monitoring
locations.
In
10,000
Monte
Carlo
cross-validation
iterations,
hourly-annual
average
R2
values
NO2
were
0.77-0.79
(RMSE:
root
mean
squared
error
5.3-5.7
µg/m3),
0.87-0.89
O3
(RMSE
=
3.6-3.8
µg/m3)
95%
confidence
interval.
annual
was
0.80
4.9
0.86
3.2
aggregating
estimates.
surfaces
freely
available
non-commercial
use.
these
exposure
assessment,
all
residential
locations,
neighbourhoods
urban
areas,
unlikely
be
below
2021
World
Health
Organisation
Quality
Guidelines
threshold
(10
concentrations
µg/m3).
Rural
suburban
areas
likely
exceed
peak-season
8-hour
daily
maximum
(60
Fountains
injected
into
homogeneous
fluids,
characterized
by
combined
temperature
and
concentration
effects,
are
common
in
both
natural
environmental
settings.
In
this
study,
the
capacities
of
several
machine
learning
models,
including
support
vector
regression,
multi-layer
perceptron,
random
forests,
XGBoost,
CatBoost,
AdaBoost,
LightGBM,
were
investigated
to
clarify
transient
flow
behavior
fountains.
The
results
indicated
that
perceptron
was
superior
other
models
as
it
provided
improved
coefficient
determination,
root
mean
squared
error,
absolute
error.
This
study
confirmed
techniques
have
great
potential
Ecotoxicology and Environmental Safety,
Год журнала:
2025,
Номер
291, С. 117793 - 117793
Опубликована: Янв. 31, 2025
Gut
microbiota
plays
a
crucial
role
in
human
health
and
can
be
influenced
by
environmental
factors.
While
past
studies
have
examined
the
impact
of
environment
on
gut
microbiota,
vulnerable
populations
often
been
overlooked.
This
study
aimed
to
investigate
association
between
exposures,
air
pollution
greenspace,
asthmatic
children.
Data
were
collected
during
recovery
period
for
41
eligible
Air
was
estimated
using
an
ensemble
learning
model
that
combined
regression
machine-learning
algorithms,
while
greenspace
quantified
normalized
difference
vegetation
index
(NDVI)
green
land-cover
data.
The
lag
effects
exposures
assessed
within
defined
buffer
zones
surrounding
each
child's
residence.
A
generalized
additive
applied
examine
associations.
Results
revealed
marginally
significant
negative
1-day
exposure
NO₂
indices,
such
as
observed
bacteria
(Coef.:
-1.130;
95
%CI
-2.287,
0.027)
bacterial
richness
-2.420;
-4.987,
0.146).
8-day
lagged
average
PM2.5
O₃
also
showed
impacts
diversity.
In
contrast,
1-month
positively
associated
with
indices.
linked
specific
abundances,
Streptococcus.
underscores
need
further
research
how
factors
may
influence
immunity
children
altering
microbiota.