The annual ozone hole reached its peak extent of 6.3 million square miles (16. 4 million square kilometers) on Sept. 8, and then shrank to less than 3.9 million square miles (10 million square ...
Ozone levels in Dallas-Fort Worth are the highest they’ve been in the past three years. And those numbers are not likely to go down to safe levels, according to the North Central Texas Council of ...
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