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  • markwillson

    The atmosphere is a complex dynamic natural gaseous system that is essential to support life on planetEarth. Stratospheric ozone depletion due to air pollution has long been recognized as a threat to human health as well as to the Earth's ecosystems.

  • stevenash

    The subsequent increase in temperature causes problems such as melting the polar ice caps which raise sea levels and cause flooding to low-lying land, as well as causing more extremes in seasons which threatens wildlife survival and the natural rhythm of life.

  • Zachary Slobig

    I was in Beijing in the Spring of 2007 (just after that spell of really terrible air) and I found it pretty much unbearable. I thought Los Angeles summers were bad. Keep up the great work keeping this issue in the global conversation. It would be nice to have analogous projects in other top 'bad air cities'— LA certainly comes to mind, but definitely Mexico City and Santiago come to mind as well. Do you also know of this project, Michael?

  • Yasha Wallin

    wow, this is really disturbing. What causes these rapid spikes, like you during Christmas 2007 when the air quality was the worst?

    • mkzhao

      a cocktail of factors: lack of wind, cold air that sinks pollution, all the sources probably pumping out crazy at this time before Chinese New Year when everything is supposed to take a break. We have cars, industrial pollution, sometimes farmers burning stalks, dust from Gobi, coal burning in the region (not much in Beijing), etc. etc. A very long list of things, and very complicated. And difficult to clean up shortly.