Helena Joyce
The coronavirus lockdowns have had a significant impact on air quality in some of the world's most polluted cities. In India, lockdowns led to a notable decrease in air pollution in six out of the ten most polluted cities globally. Similarly, cities in Europe like Milan, which previously had some of the worst pollution levels on the continent, experienced a significant improvement in air quality during lockdowns. These temporary improvements in air quality have offered a glimpse of what can be achieved through reduced human activity and serve as a call to action for governments and individuals alike to address the pressing issue of air pollution and its detrimental effects on human health and the environment.
| Characteristics | Values |
|---|---|
| Date of data | 2020-04-22 |
| Location of data | The Independent |
| Number of cities with reduced nitrogen dioxide pollution | 2 |
| Cities with reduced nitrogen dioxide pollution | Rome, northeastern US |
| Percentage decrease in nitrogen dioxide pollution in Rome | 49% |
| Percentage decrease in nitrogen dioxide pollution in the northeastern US | 30% |
| Animals found in strange places | Coyotes (Chicago's Michigan Avenue, San Francisco's Golden Gate Bridge), goats (Wales), puma (Santiago, Chile) |
| City with some of the worst pollution in Europe | Milan |
| Milan's plan to reduce car usage | Reallocate 35km of street for new cycle paths |
| Number of cities in the world with air pollution levels meeting the World Health Organization's annual PM2.5 guideline of less than 5 µg/m3 in 2024 | 17% |
| Number of cities in the top 20 most air-polluted cities in 2024 located in India | 11 |
| City with the worst air pollution globally in 2024 | Byrnihat, India |
| PM2.5 concentration in Byrnihat | 128.2 micrograms per cubic meter |
| City with the second-worst air pollution levels in 2024 | Delhi, India |
| Number of cities in the top 20 most polluted cities in 2024 located in Asia | 19 |
| City outside of Asia in the top 20 most polluted cities in 2024 | N'Djamena, Chad |
| City with the worst ozone pollution in the US | Los Angeles-Long Beach |
Explore related products
What You'll Learn
Air pollution fell in cities from New Delhi to Milan
The coronavirus lockdowns had a significant impact on air pollution levels in cities worldwide. From New Delhi to Milan, the air became cleaner as people stayed home and travel rates decreased.
In India, a lockdown was imposed that shut down schools, workplaces, and transport, leading to a notable decline in air pollution. On the first day of the lockdown, average PM 2.5 pollution levels dropped by 22%, and nitrogen dioxide (NO2) levels decreased by 15%. This is especially significant for public health, as India accounts for the highest number of pollution-related deaths worldwide, with over 2 million people dying annually due to pollution-related causes. The lockdown provided a glimpse of how human activities contribute to air pollution, and the potential for improvement if emissions are reduced.
New Delhi, in particular, has consistently ranked as one of the world's most polluted capitals. In 2024, it was listed as the city with the second-worst air pollution levels globally, with a PM2.5 concentration of 91.8. The satellite cities of Faridabad, Loni, Delhi, Gurugram, Noida, and Greater Noida also featured on the list of polluted cities. The severe air pollution in these areas is attributed to industrial emissions, vehicle exhaust, and the reliance on fossil fuels, exacerbated by weak regulations and unfavourable seasonal weather patterns.
Milan, Italy, another city known for its high pollution levels, also experienced a positive shift during the lockdown. The city had some of the worst pollution in Europe, primarily from vehicle emissions. As a result of the lockdown, Milan saw a significant reduction in traffic, leading to cleaner air. The city has since taken steps towards a greener future, with plans to reallocate 35km of streets for new cycle paths.
The decrease in air pollution during the coronavirus lockdowns in these cities demonstrates the impact of human activities on air quality. It highlights the need for sustainable practices and the potential for improvement if emissions are reduced and cleaner alternatives are prioritized.
Stay Pure: Avoid Worldly Pollution
You may want to see also
Explore related products
Animals were spotted in unusual places
The coronavirus lockdowns created a global experiment in reducing pollution in some of the world's busiest cities. Residents in some cities noticed animals appearing in unusual places and at odd times. Coyotes were seen strolling along downtown Chicago's Michigan Avenue and near San Francisco's Golden Gate Bridge. Goats were spotted in a town in Wales, and a puma was seen roaming the streets of Santiago, Chile.
The lockdowns to slow the spread of coronavirus had an unintended consequence of reducing human travel, which in turn reduced pollution. This allowed animals to venture into urban areas without being disturbed by the usual hustle and bustle of city life.
The cleaner air and quieter streets created by the lockdowns provided a rare opportunity for animals to explore beyond their natural habitats. With less traffic and human activity, animals felt safer to wander into urban environments, resulting in some surprising encounters for city dwellers.
The presence of these animals in urban areas offered a unique perspective on the impact of human activity on wildlife. It highlighted the ways in which wildlife may adapt or change their behaviours when given the space to do so. It also served as a reminder of the importance of balancing human activities with the preservation and protection of natural habitats.
The sightings of these animals in cities served as a powerful reminder of the interconnectedness between humans and nature. It showed that when humans pause their regular activities, nature has a chance to thrive and explore new territories. It also emphasized the need for humans to coexist with wildlife and find ways to minimize our impact on their natural environments.
How Schools Can Stop Polluting the Environment
You may want to see also
Explore related products
India's air pollution fell by 22% on the first day of lockdown
The COVID-19 lockdown in India led to a significant drop in air pollution. On the first day of the lockdown, the average PM 2.5 pollution levels decreased by 22%, and nitrogen dioxide (NO2) dropped by 15%. This is a crucial public health issue, as India has the highest number of pollution-related deaths worldwide, with over 2 million people dying each year due to poor air quality.
The lockdown shut down schools, workplaces, and transport, reducing major urban sources of air pollution, such as traffic, industry, and construction. This provided researchers with an opportunity to study the contribution of local sources of air pollutants during normal meteorological conditions.
The reduction in atmospheric pollutants resulted in a decrease in local day and night-time temperatures, which is significant for sustainable urban development planning. The lockdown's impact on air quality was observed in six major urban areas: Delhi, Mumbai, Kolkata, Chennai, Bangalore, and Hyderabad. There was a substantial decline in nitrogen dioxide (NO2), a greenhouse gas emitted from fossil fuel combustion, with an average decrease of 12% across India and 31.5% over the six cities.
While the lockdown improved air quality, researchers from York University caution that the absence of visible smog can be deceiving. They found that some air pollutants, such as ozone, increased even as others decreased. This highlights the complex interactions between emissions, meteorology, and chemistry that influence air pollution.
The COVID-19 lockdown in India had a notable impact on reducing air pollution, improving public health, and providing insights into the contributions of local sources of pollutants. However, the full picture is complex, and the interaction of various factors, including meteorology, needs to be considered to accurately understand the impact on air quality.
Biomass Power Plants: Clean Energy or Polluters?
You may want to see also
Explore related products
$169.99 $179.99
$38
Milan reallocated 35km of streets for cycle paths
Milan, one of Europe's economic powers, has some of the worst pollution levels on the continent. In an attempt to reduce car usage, the city has been working for years to improve its sustainable transport credentials. As part of this, Milan reallocated 35km of streets for cycle paths when it reopened from lockdown.
The Strade Aperte plan, which translates to 'open roads', includes low-cost temporary cycle lanes, new and widened pavements, 20mph speed limits, and pedestrian and cyclist priority streets. Marco Granelli, a deputy mayor of Milan, said:
> We worked for years to reduce car use. If everybody drives a car, there is no space for people, there is no space to move, there is no space for commercial activities outside the shops. Of course, we want to reopen the economy, but we think we should do it on a different basis from before.
The city has also seen the development of transport networks such as a new metro line, which will be ready for 2022. Milan's most important cycle path connects the city centre to Monza, passing through the historic Milanese streets of Corso Venezia and Corso Buenos Aires.
Milan's efforts to improve sustainability are part of a global movement to reduce pollution in some of the world's busiest cities. Lockdowns implemented to slow the spread of coronavirus unintentionally created a worldwide experiment in pollution reduction. From New Delhi to Milan, air quality improved as people stayed at home and travel rates decreased.
Swamp Coolers: Do They Invite Pollution In?
You may want to see also
Explore related products
![Handbook of NOAA systems and services for marine and Great Lakes pollution data and information 1992 [Leather Bound]](https://m.media-amazon.com/images/I/61IX47b4r9L._AC_UY218_.jpg)
The UN Secretary-General urged a green recovery
The coronavirus lockdowns have had a significant impact on the world's most polluted cities, leading to a notable decrease in air pollution. For instance, in India, a lockdown that shut down schools, workplaces, and transport led to a 22% decrease in average PM 2.5 pollution levels and a 15% drop in nitrogen dioxide (NO2) on the first day. Similarly, in the northeastern US, nitrogen dioxide pollution decreased by 30%, and in Rome, air pollution levels were down by 49% from mid-March to mid-April compared to the previous year.
The UN Secretary-General, António Guterres, has urged the world to use the recovery from the COVID-19 pandemic to transition to a greener and more sustainable future. He has called on governments to ensure that the recovery creates new jobs and businesses through a clean, green transition. Mr. Guterres emphasized that taxpayer money should be invested in sustainable sectors to create green jobs rather than bailing out heavily polluting industries.
This call for a green recovery is supported by various experts and organizations. Climate advisers in the UK have urged the government to focus on low-carbon work programs during the economic restart to generate new jobs, protect the climate, and promote a fairer economy. Similarly, green campaigners in the UK have advocated for prioritizing people's well-being, saving the climate, and building a sustainable economy over rebuilding the profits of damaging industries.
Additionally, scientists have confirmed that electric cars produce less CO2 than petrol vehicles, highlighting the importance of including climate action in long-term recovery plans. The Guardian, in an editorial, urges the EU to stick to its green new deal, recognizing that the world faces not one but two existential crises: the coronavirus pandemic and the climate emergency.
The COVID-19 pandemic has provided a unique opportunity to address the unfolding environmental crisis and biodiversity loss. By acting decisively, we can protect our planet and create a healthier and more sustainable future for all.
Trump's Legacy: More Pollution, Less Environmental Protections
You may want to see also
Frequently asked questions
The lockdowns implemented to curb the spread of COVID-19 have resulted in significant reductions in pollution in some of the world's busiest cities, such as New Delhi and Milan, due to decreased human and transport activity.
During the initial days of the lockdown in India, the average PM 2.5 pollution levels decreased by 22%, and nitrogen dioxide (NO2) dropped by 15%. In the northeastern US, nitrogen dioxide pollution decreased by 30%, and Rome saw a 49% reduction in air pollution levels compared to the previous year.
Industrial emissions, vehicle exhaust, and the reliance on fossil fuels, coupled with weak regulations and unfavourable seasonal weather patterns, contribute significantly to high pollution levels in cities.
In 2024, 13 of the top 20 most polluted cities were in India, with Byrnihat in northeastern India recording the worst air pollution globally. Delhi, the capital, has consistently ranked high in air pollution levels. Four cities in Pakistan and one each in China and Kazakhstan are also among the most polluted. N'Djamena, Chad, was the only non-Asian city in the top 20.
The pandemic has served as a wake-up call for many cities to prioritize sustainability and green initiatives in their recovery efforts. For example, Milan has planned to reallocate 35km of streets for new cycle paths to reduce car usage. UN Secretary-General Antonio Guterres has urged countries to use the recovery as an opportunity to create a greener future and address the climate crisis.
