To the Editor,
More than 5 months passed since the COVID-19 started affecting the world. The World
Health Organization (WHO) had declared it a pandemic in March 2020, and most countries
of the world have implemented a state of lockdown thereafter (World Health Organization
2020). The lockdown resulted in changes in lifestyle, disruption of the economy, loss
of jobs, academic disruption, and many more socio-political challenges. At the same
time, many positive changes also became evident. The reduction in air pollution is
one of them. South-East Asian countries like India, Bangladesh, Pakistan, and Afghanistan
are some of the world’s most polluted countries, in terms of air quality. China which
was the origin of this COVID-19 pandemic is also a country with a high level of air
pollution. Delhi and its surrounding cities, for example, are considered as the topmost
polluted cities in the world (IQAir nd). After lockdown in this region, there was
a 49% reduction in the air quality index (AQI) as observed in a study. AQI measures
pollutants like particulate matter, sulfur dioxide, nitrous oxide, etc. (The New Indian
Express 2020).
Nitrogen dioxide (NO2) is considered as a highly lethal pollutant that is emitted
due to the burning of fossil fuels in vehicles. The National Aeronautics and Space
Administration (NASA) and the European Space Agency (ESA) had released images suggesting
an improvement of the environmental quality and reduction of the emission of NO2 up
to 30% post-lockdown in China (Muhammad et al. 2020). Similar changes were also observed
in other countries like France, Italy, Spain, and the USA. It was claimed on the basis
of the satellite images of the countries before and after lockdown. Fresh images from
NASA showed a rebound of NO2 level in China with the ending of lockdowns and resuming
of the economic activities (NASA Earth Observatory 2020). Another study conducted
in São Paulo, Brazil showed a drastic reduction in Nitric oxide, NO2, and Carbon monoxide
concentrations during the lockdown phase. In the same study, they also found about
a 30% increase in ozone concentrations in the urban areas that were attributable to
a decrease in traffic (Nakada and Urban 2020). However, most of the studies used satellite
images to measures the air pollution level in these countries, but no actual scale
measurement of air pollution has been done so far globally, to check and compare the
air pollution level during, before, and after the lockdown period. It is also imperative
to find out how indoor air quality has changed during this lockdown as people are
staying at home longer than usual.
WHO states that the bad quality of the air is associated with the death of about 7
million people which is more than road traffic accident-related deaths. Nine out of
10 individuals breathe air containing pollutants. Most of the deaths related to air
pollution are due to non-communicable diseases such as 24% of brain stroke-related
deaths, 25% heart disease-related deaths, 43% of lung diseases and lung cancer-related
deaths are attributed to air pollution (World Health Organization 2018).
A call for comments has been made in regard to the climate and clean air responses
to COVID-19 so that the proper attention could be warranted to sustain the improved
air quality during the busy days of life (Agrawala et al. 2020). As lockdown was found
to be an effective strategy to control all forms of pollutions, including air pollution,
there is a need to think about the periodic implementation of lockdown in an organized
fashion to maintain the fresh air quality. Now, this is the time to think about making
the world more liveable by making it pollution-free. So far as the air pollution is
concerned, the current COVID-19 related lockdown has been proved to be a blessing
in disguise. However, country-specific, as well as culture-specific, strategies should
be considered as there are strong chances of failure of universal strategies without
considering the local factors. For example, measures like alternative energy sources,
policies to manage economic challenges, lifestyle modifications, utilizing the natural
resources can be implemented, based on the needs. All the countries should develop
the air pollution surveillance system to measure, monitor, and regulate the air quality
level (Kutlar Joss et al. 2017). Also, there is a need to create international pressure
to raise the political will in the low- and middle-income countries. More research
and funds should make ready aiming at the reduction of environmental pollution.