Earth's ozone hole found to be shrinking

Ozone Hole

Ozone Hole

The hole in the ozone layer over Antarctica is the smallest it's been since 1988, NASA said.

The largest the hole became this year was about 7.6 million square miles wide, about 2½ times the size of the United States, in September.

A year ago saw the smallest ozone hole on record for this same reason.

"This is what we would expect to see given the weather conditions in the Antarctic stratosphere", Newman added.

The Antarctic ozone hole was first detected in 1985. "This is a year in which the weather conditions led to better ozone (formation)".

Massive recall for Kidde fire extinguishers
Everington and many others with Greenville Fire/Rescue have been busy inspecting fire extinguishers and smoke detectors, too. More than 40 million fire extinguishers in the US and Canada are being recalled because they might not work in an emergency.

Thirty years ago, the worldwide community signed the Montreal Protocol on Substances that Deplete the Ozone Layer and began regulating ozone-depleting compounds.

Increased fear of the ozone hole deteriorating and leading to more cases of skin cancer led to the signing of the Montreal Protocol.

The smaller ozone hole in 2017 was strongly influenced by an unstable and warmer Antarctic vortex - the stratospheric low pressure system that rotates clockwise in the atmosphere above Antarctica.

NASA and NOAA scientists said warmer temperatures and a stormier upper atmosphere helped keep damaging chemicals chlorine and bromine from eating ozone from the layer that protects the Earth's surface from harmful ultraviolet rays.

The hole that hovers over Antarctica has been slowly recovering, scientists say, due to an global ban on harmful chemicals that were previously used in refrigerants and aerosols. According to NASA, the average maximum extent of the ozone hole since 1991 has hovered at about 10 million square miles (25.8 million square km).

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Marcin Gortat has been very productive in the middle, averaging 11.9 points and pulling down 10.1 rebounds per game. You can see Beal try to suppress a smile as Wall dives into the talking point.

The ozone layer is expected to return to its 1980 levels by the year 2070, says Nasa.

In spite of this recovery, the space agency mentions that there is enough ozone depleting material in the atmosphere to cause significant damage. The three-oxygen molecule is toxic at ground level, but high in the atmosphere, it deflects unsafe ultraviolet rays from reaching Earth's surface.

Each year, the hole reaches its peak in September and begins to shrink after mid-September.

"In the past, we've always seen ozone at some stratospheric altitudes go to zero by the end of September", said Bryan Johnson, NOAA atmospheric chemist.

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