For someone living in polluted New Delhi, for example, those 20,000 breaths include the equivalent of around 20 grains of table salt worth of particulate matter deposited in their lungs each day.
Health News : Not a day seems to go by without a story of an “airpocalypse,” usually somewhere in a developing nation. It’s hard not to empathize with the people in the smoggy images of New Delhi or Ulaanbataar or Kathmandu, often wearing masks, walking to school or work through soupy cloudiness.
Last year, a study found that more than 8 million people per year die early from air pollution exposure. This amounts to more deaths than diarrheal disease, tuberculosis and HIV/AIDS combined.
As a researcher in air pollution and its health effects, I know that even if you don’t live in these places, air pollution likely still affects your quality of life.
Where does air pollution come from?
You might imagine air pollution as smoke pouring out of a factory chimney or the tailpipe of a car. While these are important sources of air pollution, there are many others. Air pollution includes chemicals humans put into the atmosphere and chemicals released by natural events. For example, forest fires are a large source of air pollutants that affect many communities. Dust that’s picked up by wind can also contribute to poor air quality.
Ronald Reagan famously said that “trees cause more pollution than automobiles do.” While this myth has been debunked, he was right in at least some ways. Trees do release certain gases, such as volatile organic carbon, that are ingredients in air pollution chemistry. This, when mixed together with emissions from cars and industry, leads to increases in other types of pollution, such as ozone.
There isn’t much that scientists can, or should, do about tree emissions. Public health researchers like myself focus most on the ingredients from human activities – from burning petroleum to emissions controls on industrial facilities – because these are sources located close to where people live and work. There are also many chemical reactions that occur in the air itself. These reactions create what are known as secondary pollutants, some of which are quite toxic.
Finally, it’s important to realize that air pollution knows no boundaries. If a pollutant is emitted in one location, it very easily moves across borders – both regional and national – to different places. New Delhi, for example, experiences seasonal pollution, thanks to extensive burning of agricultural fields some 200 miles away. New Delhi is an extreme example. But, even if you live in a less polluted environment, pollutants emitted elsewhere often travel to where other people live and work, as seen in recent wildfires in California.
