![Air samples from NOAA's Mauna Loa Atmospheric Baseline Observatory provided the first evidence of new production of the ozone-destroying chemical CFC-11, in violation of the Montreal Protocol. A new study in Nature pinpoints the source of these emissions to two provinces in China. (Image credit: Eric Johnson/NOAA Corps) Air samples from NOAA's Mauna Loa Atmospheric Baseline Observatory provided the first evidence of new production of the ozone-destroying chemical CFC-11, in violation of the Montreal Protocol. A new study in Nature pinpoints the source of these emissions to two provinces in China.](/sites/default/files/styles/landscape_width_1275/public/legacy/image/2019/Jun/PHOTO%20-%20NOAA%27s%20Mauna%20Loa%20Atmospheric%20%20Baseline%20Observatory%20sits%20at%2011%2C140%20feet%2C%20on%20top%20of%20Hawaii%27s%20tallest%20volcano%20-%20Eric%20Johnson%20NOAA%20Corps%20-%201125x534%20-%20Landscape.jpg?itok=w7Kc7DcU)
Air samples from NOAA's Mauna Loa Atmospheric Baseline Observatory provided the first evidence of new production of the ozone-destroying chemical CFC-11, in violation of the Montreal Protocol. A new study in Nature pinpoints the source of these emissions to two provinces in China. (Image credit: Eric Johnson/NOAA Corps)