"Ozone hole said back to average size" (Oct. 21, Page A-5) sounded like good news, but the headline misrepresented the findings. The bad news appears in the last paragraph: "There's no way we could say we're seeing real improvement." The "average" referred to in the heading refers to only the past two decades, and does not mean "normal." Normality would be no ozone hole, as that atmospheric defect didn't develop until 1985 as a consequence of ozone-depleting man-made chemicals.
The slight shrinkage of the ozone hole back to what has been "average" since then is, according to the World Meteorological Organization, due to transient weather conditions and "not a sign of recovery." That scientific body advises, "As greenhouse gases accumulate in the atmosphere, temperatures will fall in the stratosphere, increasing the threat of severe ozone holes in the future." Governments must enact mandatory controls to mitigate and hopefully reverse this aspect of global climate change (misnamed "global warming").