The Antarctic ozone hole last week peaked at a moderately large size for the third straight year — bigger than the size of North America — but experts say it’s still generally shrinking despite recent blips because of high altitude cold weather.
The ozone hole hit its peak size of more than 10 million square miles (26.4 million square kilometers) on October 5, the largest it has been since 2015, according to NASA. Scientists say because of cooler than normal temperatures over the southern polar regions at 7 to 12 miles high (12 to 20 kilometers) where the ozone hole is, conditions are ripe for ozone-munching chlorine chemicals.
