"Too much ozone on the ground is bad. But too little ozone up high — an "ozone hole" — is also bad." http://www.vox.com/2014/11/26/7292803/ozone-rule-proposal …
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"Too much ozone on the ground is bad. But too little ozone up high — an "ozone hole" — is also bad." http://www.vox.com/2014/11/26/7292803/ozone-rule-proposal …