Toxics,
Journal Year:
2023,
Volume and Issue:
11(8), P. 651 - 651
Published: July 27, 2023
In
order
to
illustrate
pollution
characterization,
source
apportionment,
and
risk
assessment
of
VOCs
in
Beijing,
Baoding,
Shanghai,
field
observations
CO,
NO,
NO2,
O3,
volatile
organic
compounds
(VOCs)
were
conducted
2019.
Concentrations
the
highest
Beijing
(105.4
±
52.1
ppb),
followed
by
Baoding
(97.1
47.5
ppb)
Shanghai
(91.1
41.3
ppb).
winter
(120.3
61.5
among
three
seasons
tested,
summer
(98.1
+
50.8
autumn
(75.5
33.4
Alkenes
most
reactive
VOC
species
all
cities,
accounting
for
56.0%,
53.7%,
39.4%
ozone
formation
potential
respectively.
aromatics
species,
particularly
ethene,
propene,
1,3,5-trimethylbenzene,
m/p-xylene.
Vehicular
exhaust
was
principal
27.0%,
30.4%,
23.3%
Industrial
manufacturing
second
largest
(23.6%)
(21.3%),
solvent
utilization
(25.1%).
The
empirical
kinetic
modeling
approach
showed
that
O3
limited
both
nitric
oxides
at
Fangshan
(the
suburban
site)
Xuhui
urban
site).
Acrolein
only
substance
with
an
average
hazard
quotient
greater
than
1,
indicating
significant
non-carcinogenic
risk.
1,2-dibromoethane
had
R-value
1.1
×
10−4
posed
a
definite
carcinogenic
Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: Nov. 21, 2023
Volatile
organic
compounds
(VOCs)
are
major
air
pollutants
often
designated
as
specific
hazardous
or
toxic.
This
study
analyzed
the
trends
in
concentration
changes
and
influencing
factors
of
VOCs
underground
subway
stations
Seoul
Metro
before
(2019)
after
(2021)
COVID-19
pandemic.
A
total
506
samples
were
collected
from
253
on
lines
1-8
between
May
2019
September
2021.
Total
VOC
concentrations
increased
pandemic
3.8
times
over.
The
deeper
station
platform,
greater
difference
2021,
which
was
positively
related.
Average
highest
(52.8
µg/m3)
at
a
depth
25-30
m
lowest
(23.9
<
10
2019.
In
conclusion,
excessive
disinfection
during
resulted
Metro,
especially
stations.
Less
frequent
quarantine
is
recommended
to
improve
quality.
Improving
of
air
quality,
particularly
the
removal
indoor-air
pollutants
with
direct
environmental
and
health
implications,
remains
a
significant
challenge
in
modern
society.
We,
herein,
present
novel
approach
using
photocatalytic
eco-friendly
paint
to
effectively
eliminate
indoor
disinfect
surfaces.
The
study
focuses
on
development
characterization
versatile
photocatalyst,
Ultra
Small
Porous
Nitrogen-doped
Titanium
dioxide
(USPNT),
which
has
been
successfully
incorporated
into
formulation.
UPSNT
photocatalyst
was
synthesized
via
probe
sonication
coupled
sol-gel
technique,
resulting
anatase
phase
high
surface
area
83
m²/g.
Various
coating
methodologies,
including
top
mixed
coating,
were
employed
investigate
catalytic
activity
USPNT
paint,
specifically
efficiency
UPSNT-coated
removing
under
simulated
illuminations.
oxidation
p-xylene
pollutant,
investigated
an
ISO
model
photoreactor,
showcasing
efficient
decomposition
carbon
water.
Additionally,
USPNT-incorporated
paints
showed
capability
remove
dirt,
such
as
organic
dyes,
confirming
its
self-cleaning
properties.
Moreover,
had
potential
disinfection
capabilities
against
E.
coli
contaminant.
developed
would
provide
promising
solution
combat
pollution
ensure
healthier
environment.
BMC Public Health,
Journal Year:
2024,
Volume and Issue:
24(1)
Published: Nov. 6, 2024
During
the
COVID-19
pandemic,
non-therapeutic
interventions
(NPIs),
such
as
traffic
restrictions,
work
stoppages,
and
school
suspensions,
have
led
to
a
sharp
decline
in
concentration
of
air
pollutants
epidemic
sites.
However,
few
studies
focused
on
impact
pollutant
changes
risk
nonaccidental
death.
We
selected
Yancheng
City,
China,
study
site
applied
Generalized
Additive
Model
(GAM)
based
quasi-Poisson
distribution
evaluate
atmospheric
exposure
death
local
residents.
The
time
span
this
was
set
from
January
1,
2013,
December
21,
2022,
that
is,
before
after
outbreak
COVID-19.
some
has
greatly
varied
COVID-19,
with
significant
for
PM2.5
(−
43.4%),
PM10
38.5%),
SO2
62.9%),
NO2
22.6%),
but
an
increase
O3
(+
4.3%).
Comparative
analysis
showed
contributed
increased
With
by
10
µg/m³,
excess
relative
risks
(ER)
residents
1.01%
(95%CI:
0.19%,1.84%).
stratified
revealed
impacted
deaths
both
men
women
After
had
effect
male
deaths.
concentrations
PM2.5,
PM10,
ER
female
1.52%
(0.38%,2.67%),
0.58%
(0.02%,1.13%),
15.09%
(5.73%,25.28%),
respectively.
Before
five
cardiovascular
disease
(CVD).
only
significantly
affected
CVD.
In
addition,
we
discovered
due
respiratory
diseases
Air
different
effects
outbreak.
A
decrease
NPIs
reduction
Atmospheric chemistry and physics,
Journal Year:
2024,
Volume and Issue:
24(23), P. 13587 - 13601
Published: Dec. 10, 2024
Abstract.
Online
volatile
organic
compounds
(VOCs)
were
monitored
before
and
after
the
Omicron
policy
change
at
an
urban
site
in
polluted
Zhengzhou
from
1
December
2022
to
31
January
2023.
The
characteristics
sources
of
VOCs
investigated.
daily
mean
concentrations
PM2.5
total
(TVOCs)
ranged
53.5
239.4
µg
m−3
15.6
57.1
ppbv,
respectively,
with
values
111.5
±
45.1
36.1
21.0
throughout
period.
Two
severe
pollution
events
(designated
as
case
2)
identified
accordance
National
Ambient
Air
Quality
Standards
(NAAQS)
(China's
2012).
Case
(5
10
=
142.5
m−3)
2
(1
8
181.5
occurred
during
infection
period
(when
“full
nucleic
acid
screening
measures”
was
effect)
recovery
(after
canceled),
respectively.
TVOC
for
are,
1.3
1.8
times
higher
than
those
1.
precise
influence
disparate
meteorological
circumstances
on
two
incidents
is
not
addressed
this
study.
results
positive
matrix
factor
modeling
demonstrated
that
primary
source
observation
industrial
emissions,
which
constituted
32
%
VOCs,
followed
by
vehicle
emissions
(27
%)
combustion
(21
%).
In
1,
accounting
VOCs.
contrast,
2,
contribution
vehicular
emission
increased
33
became
secondary
aerosol
formation
potential
found
be
37.6
65.6
m−3,
largest
SOA
(SOAP)
accounted
majority
(63
%;
23.8
m−3),
(18
After
end
epidemic
resumption
productive
activities
society,
difference
proportion
(SOA)
generated
various
decreased.
Most
SOAP
came
solvent
use
fuel
evaporation
sources,
(20.9
26
(16.8
On
days
minimal
pollution,
remain
main
contributors
formation.
Therefore,
regulation
industry,
solvent-using
industries,
motor
vehicles
needs
prioritized
control
problem.
