Scientific Reports,
Journal Year:
2021,
Volume and Issue:
11(1)
Published: Feb. 19, 2021
Abstract
On
January
30,
2020,
India
recorded
its
first
COVID-19
positive
case
in
Kerala,
which
was
followed
by
a
nationwide
lockdown
extended
four
different
phases
from
25th
March
to
31st
May,
and
an
unlock
period
thereafter.
The
has
led
colossal
economic
loss
India;
however,
it
come
as
respite
the
environment.
Utilizing
air
quality
index
(AQI)
data
during
this
adverse
time,
present
study
is
undertaken
assess
impact
of
on
Ankleshwar
Vapi,
Gujarat,
India.
AQI
obtained
Central
Pollution
Control
Board
assessed
for
phases.
We
compared
phase
with
coinciding
2019
determine
changes
pollutant
concentrations
lockdown,
analyzing
daily
six
pollutants
(PM
10
,
PM
2.5
CO,
NO
2
O
3
SO
).
A
meta-analysis
continuous
performed
mean
standard
deviation
each
phase,
their
differences
were
computed
percentage
comparison
2019;
along
linear
correlation
analysis
regression
relationship
among
trend
days.
results
revealed
patterns
gradual
rapid
reduction
most
2.5,
),
increment
ozone
concentration
observed
due
drastic
80.18%.
Later,
increases
other
also
restrictions
eased
phase-4
1.
between
two
cities
found
that
factors
like
distance
Arabian
coast
industrial
setups
played
vital
role
emission
trends.
Annals of Medicine and Surgery,
Journal Year:
2020,
Volume and Issue:
56, P. 38 - 42
Published: June 14, 2020
COVID-19's
daily
increasing
cases
and
deaths
have
led
to
worldwide
lockdown,
quarantine
some
restrictions.
This
study
aims
analyze
the
effect
of
lockdown
days
on
spread
coronavirus
in
countries.
COVID-19
data
were
collected
for
49
countries
that
implemented
between
certain
dates
(without
interruption).
The
correlation
tests
used
analysis
based
unconstrained
(normal)
constrained
(Tukey-lambda).
was
significantly
correlated
with
pandemic
(r
=
−0.9126,
F-ratio
6.1654;
t-ratio
2.40;
prob
>
.0203
observations)
Tukey-lambda
0.7402,
λ
0.14).
one
social
isolation
restrictions,
has
been
observed
prevent
pandemic,
showed
virus
can
be
reduced
by
this
preventive
restriction
study.
offers
initial
evidence
suppressed
a
lockdown.
application
governments
is
also
thought
effective
psychology,
environment
economy
besides
having
impact
Covid-19.
Sustainable Cities and Society,
Journal Year:
2020,
Volume and Issue:
62, P. 102382 - 102382
Published: July 13, 2020
The
COVID-19
pandemic
elicited
a
global
response
to
limit
associated
mortality,
with
social
distancing
and
lockdowns
being
imposed.
In
India,
human
activities
were
restricted
from
late
March
2020.
This
'anthropogenic
emissions
switch-off'
presented
an
opportunity
investigate
impacts
of
mitigation
measures
on
ambient
air
quality
in
five
Indian
cities
(Chennai,
Delhi,
Hyderabad,
Kolkata,
Mumbai),
using
in-situ
measurements
2015
For
each
year,
we
isolated,
analysed
compared
fine
particulate
matter
(PM2.5)
concentration
data
25
11
May,
elucidate
the
effects
lockdown.
Like
other
cities,
observed
substantial
reductions
PM2.5
concentrations,
19
43%
(Chennai),
41–53%
(Delhi),
26–54%
(Hyderabad),
24–36%
(Kolkata),
10–39%
(Mumbai).
Generally,
larger
traffic
volumes
showed
greater
reductions.
Aerosol
loading
decreased
by
29%
11%
4%
1%
(Mumbai)
against
2019
data.
Health
related
economic
impact
assessments
indicated
630
prevented
premature
deaths
during
lockdown
across
all
valued
at
0.69
billion
USD.
Improvements
may
be
considered
temporary
benefit
as
revitalising
economy
could
reverse
this
trend.
Regulatory
bodies
must
closely
monitor
levels,
which
currently
offer
baseline
for
future
plans.
Elementa Science of the Anthropocene,
Journal Year:
2021,
Volume and Issue:
9(1)
Published: Jan. 1, 2021
The
coronavirus-19
(COVID-19)
pandemic
led
to
government
interventions
limit
the
spread
of
disease
which
are
unprecedented
in
recent
history;
for
example,
stay
at
home
orders
sudden
decreases
atmospheric
emissions
from
transportation
sector.
In
this
review
article,
current
understanding
influence
emission
reductions
on
pollutant
concentrations
and
air
quality
is
summarized
nitrogen
dioxide
(NO2),
particulate
matter
(PM2.5),
ozone
(O3),
ammonia,
sulfur
dioxide,
black
carbon,
volatile
organic
compounds,
carbon
monoxide
(CO).
first
7
months
following
onset
pandemic,
more
than
200
papers
were
accepted
by
peer-reviewed
journals
utilizing
observations
ground-based
satellite
instruments.
Only
about
one-third
literature
incorporates
a
specific
method
meteorological
correction
or
normalization
comparing
data
lockdown
period
with
prior
reference
despite
importance
doing
so
interpretation
results.
We
use
stringency
index
(SI)
as
an
indicator
severity
measures
show
how
key
pollutants
change
SI
increases.
observed
decrease
NO2
increasing
general
agreement
inventories
that
account
lockdown.
Other
compounds
such
O3,
PM2.5,
CO
also
broadly
covered.
Due
chemistry
O3
PM2.5
concentrations,
their
responses
may
not
be
linear
respect
primary
pollutants.
At
most
sites,
we
found
increased,
whereas
decreased
slightly,
SI.
Changes
other
understudied.
highlight
future
research
needs
emerging
sets
preview
state
atmosphere
world
targeted
permanent
emissions.
Finally,
emphasize
need
effects
meteorology,
trends,
when
determining
concentrations.
