“Ozone: Good up high, Bad nearby.” So goes the U.S. EPA’s catchy (?) refrain to help people distinguish between (good) atmospheric and (bad) ground-level ozone.
Fortunately, we have gotten some good news on the former in the past few days. A team of researchers has concluded that we are finally building up more good ozone; that is, the massive hole in the protective ozone layer over Antarctica is finally beginning to heal thanks to the phasing out of chlorofluorocarbons under the 1987 Montreal Protocol. It seems like the ozone layer may be on course to fully recover by the middle of the century.
Unfortunately, the news is not as great on the latter front, as we are also seeing an increase in ground-level ozone. On Tuesday, NOACA issued an ozone advisory, warning residents of Northeast Ohio that ambient levels of ground-level ozone may reach harmful levels, which … Continue reading