The ozone hole has not been "healed." At the present rate of recovery it's going to be at least fifty or more years before we're back to pre-CFC levels.

Smog is a bit of a dodgy concept. When we wuz lickle it generally seemed to mean those smelly radiation fogs that were made much worse (denser, smellier and more dangerous to health) by smoke particles and sulphur dioxide from domestic fires and factory chimneys and oxides of nitrogen from exhausts. These days, smog is generally understood to mean what happens when the sun shining on layers of pollution, largely generated by vehicle exhausts, trapped under temperature inversions causes deleterious chemical changes. It doesn't necessarily have to involve the water droplets of cold-weather radiation fogs. It's generally associated with large cities in topography that helps to trap the pollution. Unless the atmospheric circulation gets a move on, smogs can linger for many days and get worse by the day.

The science supporting man-made global warming is almost irrefutable (scientists never say never and don't deal in proofs on the whole). Only vested interests such as oil companies, American politicians who daren't contest their country's profligate use of oil and the occasional idiot such as Nigel Lawson are in denial.