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Always best to consult one of the watch sites... Colorado State University is one of the participating members in a program designed to answer your question. see the links below.

Record sized Antarctic ozone hole in 2007, near record in 2008, 2009 season yet-to-occur.

The ozone hole heals when it is not winter at either the north or south pole. But the ozone layer is where UV-B is or is not absorbed by the amount of ozone along a vertical path. Ozone is still allowing more UV-B to arrive at the Earth's surface, so it appears that the ozone layer has not healed itself.

The ozone layer is self-healing. Depletion means that it gets thinner at equilibrium, when contaminants destroy ozone before sunlight gets a chance to. A way to measure the average thickness of the ozone between the Sun and any point on Earth's surface is to measure the amount of UV-B that arrives at a sensor at the surface. The size of the ozone hole is another indicator.

There is no indication that the ozone layer will reach some catastrophic failure point. So far it has shown to be a slow decrease in available ozone to block UV-B, allowing more UV-B to reach Earth's surface.

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14y ago

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