As we post this blog, most of our daily lives have been disrupted by the coronavirus COVID-19 outbreak. During a time of uncertainty shrouded by fear, we are grateful for first responders, medical staff, and scientists everywhere at the frontline of this pandemic.

We have also had many people reach out to us with questions about how air pollution is affected by the outbreak. We thought we’d take some time to start a blog series to examine the relationship between air pollution and coronavirus COVID-19.

For this first post, we would like to share our first impressions of what’s been said in the press and our interactive mapping tool for anyone who would like to explore the relationship between air quality and COVID-19.

Are reduced human activities aimed at containing the spread of COVID-19 reducing air pollution?

Clarity’s initial opinion: Since the government lockdowns began in China and Northern Italy, satellite data has shown an observable reduction of air pollution in these regions (see below). With the usual pollution sources from industrial and transportation activity on pause, air quality data over the past few weeks suggest just how fast changes in human activities can lead to cleaner air.

We are conducting further analysis and will share our findings in the next post of this “air pollution and COVID-19” series. Stay tuned!

Satellite data shows the impact of COVID on air pollution.
Satellite data source: Copernicus Sentinel 5P — ESA

Does air pollution make humans more vulnerable to COVID-19?

Clarity’s opinion: It’s very likely that air pollution makes us more vulnerable to COVID-19. Extensive research has shown that air pollution causes numerous respiratory diseases, such as pneumonia and asthma, in children and adults (link1, link2, link3, link4).

In addition, bad air quality may have increased the death toll of a previous coronavirus outbreak, the SARS pandemic of 2003. One study on SARS patients found that people living in regions with a moderate amount of air pollution were 84 percent more likely to die than those in regions with cleaner air.

However, no research on the relationship between pollution and the new COVID-19 virus has been published yet.*

*Are you a researcher working on understanding this relationship? Visit our open data tool or email us at to see how we can help.

OpenMap air pollution monitoring with COVID-19 data

Clarity has added COVID-19 data from John Hopkins University to our Clarity OpenMap. We hope this can be a helpful tool for the academic community and the public alike to take a deeper look at the relationship between COVID-19 and air pollution.

COVID-19 data available on our air quality map:

In addition to exploring active cases in each region, we’ve sorted through the data so you can visualize cases in a plot by region and time:

  • Confirmed: Estimated total number of individuals that are or have been infected
  • Recovered: Estimated total number of individuals that have recovered from the infection
  • Deaths: Estimated total number of individuals that have died from the infection
  • Active: Estimated total number of individuals that are currently infected (Active = Confirmed - Recovered - Deaths)
  • New Confirmed: Difference between “Confirmed” from the latest available report and previous day’s report

COVID-19 data vs. Air pollution data

Users can compare the air quality and COVID-19 data in the same timeline side by side and see if there is a potential relationship between COVID-19 and air pollution.

Clarity’s OpenMap shows data from air pollution monitoring across the globe.
We make the data open so that you can easily view and compare. For researchers who are interested in acquiring data via API, please email us at

We are under a shelter-in-place order in California, but very fortunate to have the ability and resources to continue our work remotely. This is not the case for everyone so I want to end this note with a reminder to practice compassion during this time of crisis. Support the most vulnerable folks of our communities by purchasing only what you need, donating money, extra supplies and food, and looking out for our neighbors.