Nitrogen dioxide pollution, averaged yearly from 2005-2011, has decreased across the United States.
Image: NASA Goddard's Scientific Visualization Studio/T. Schindler
NASA satellite images released this week in animated GIF form show how air pollution has decreased across the United States over the past decade.
"After ten years in orbit, the Ozone Monitoring Instrument (OMI) on NASA's Aura satellite has been in orbit sufficiently long to show that people in major U.S. cities are breathing less nitrogen dioxide – a yellow-brown gas that can cause respiratory problems."
After ten years in orbit, the Ozone Monitoring Instrument (OMI) on NASA's Aura satellite has been in orbit sufficiently long to show that people in major U.S. cities are breathing less nitrogen dioxide – a yellow-brown gas that can cause respiratory problems.
Nitrogen dioxide is one of the six common pollutants regulated by the U.S. Environmental Protection Agency (EPA) to protect human health. Alone it can impact the respiratory system, but it also contributes to the formation of other pollutants including ground-level ozone and particulates, which also carry adverse health effects. The gas is produced primarily during the combustion of gasoline in vehicle engines and coal in power plants. It's also a good proxy for the presence of air pollution in general.
Air pollution has decreased even though population and the number of cars on the roads have increased. The shift is the result of regulations, technology improvements and economic changes, scientists say.
But the EPA says about 142 million Americans still live in areas with unhealthy air pollution levels, and satellite imaging shows that air pollution remains a major problem in many other parts of the world.
Read more at NASA.gov, where they also offer interactive views of the data, and HD video.
It sure feels flat, right? (Life Noggin)
Because ladybug hindwings are covered by an opaque outer shell called an elytra, scientists were not sure how the wings’ folding mechanism worked until Kazuya Saito created a clear replacement shell that allowed them to film the process in super slow-motion.
Apparently scientists tend to think of themselves as more rational, objective, and intelligent than non-scientists. Makes sense. And laypeople tend to think that of scientists too. But the scientists surveyed in a new study from Tilburg University in the Netherlands apparently see themselves as much more rational, objective, and intelligent than non-scientists. Are they overconfident […]
Yes, yes there is. The ultraportable Twisty Glass Mini boasts all of the simplicity of its forebear, while fitting just a little bit better in your pocket.The Mini is perfect for casual smokers, and anyone who doesn’t have the patience or fine motor skill for rolling papers. This piece keeps the convenient design of its older […]
Learning to code is a perfect way to grow your technical sophistication, and open up a host of new career options. But since most “learn to code” initiatives focus heavily on web development, it can be tough to find good resources for general-purpose computer science outside of a 4-year degree program. To get a broad […]
While many newer smartphones boast decent water resistance, most of us are still stuck with the kind of handsets that need to spend the night in a bowl of rice when they get wet. If you want to enjoy your favorite podcasts in the shower but are holding out for your next phone upgrade, this […]