NASA Earth Observatory has released maps showing the decline of atmospheric ozone levels in the Arctic to what is approaching “the lowest levels in the modern instrumental era”: “These maps of ozone concentrations over the Arctic come from the Ozone Monitoring Instrument (OMI) on NASA’s Aura satellite. The left image shows March 19, 2010, and the right shows the same date in 2011. March 2010 had relatively high ozone, while March 2011 has low levels.”