September 23 – Hole Lotta Trouble

Today’s factismal: The ozone hole stretched to cover a city for the first time fifteen  years ago.

One of the great successes in pollution control was the 1992 international treaty banning the use of chlorofluorocarbons (CFCs) due to their effect on the ozone layer. Following the signing of the treaty, nations were required to change their refrigerators and hairsprays so that they didn’t use CFCs; the only exceptions were for national security. So with the pollution stopped, the problem was solved, right?

2009 Ozone Hole (Image courtesy NASA)

2009 Ozone Hole
(Image courtesy NASA)

Wrong. The problem with pollution is that it doesn’t stop doing harm just because you’ve stopped putting more trash into the atmosphere. You still have to deal with all of the junk that was put into the atmosphere before you stopped. Some environmentalists call this the “teenager’s room problem”: sure, your kid has gone to college and left his room empty – but you still have the ten years of empty soda cans, candy bar wrappers, and dirty laundry piled in the corners that need to be cleaned out before it can be turned into a sewing room. And that’s where we are with CFCs in the atmosphere. We’ve stopped adding them but we still have to wait for the ones in the air to break down and go away. And, until they do, we will have problems.

This year's ozone hole (Image courtesy MACC)

This year’s ozone hole
(Image courtesy MACC)

In 2000 we saw one example of the sort of problem we’ll have; the ozone hole grew to cover an area three times the size of the continental United States. It got so large that it covered all of Antarctica and part of South America, including the city of Punta Arenas. For two days, the residents were exposed to more UV radiation than normal. Though they haven’t reported much in the way of side effects that is because UV damage is a long-term problem (e.g., skin cancer, glaucoma) caused by a short-term exposure. Fortunately, that was the largest that the ozone hole has ever gotten; since then it has shrunken considerably.

Of course, a hole in the ozone layer isn’t the only problem we’ve got. If you’d like to help monitor air quality, then why not join NASA’s Citizens and Remote Sensing Observation Network Air Quality project?
http://terra.nasa.gov/citizen-science

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