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September 9, 2000 | From Times Wire Reports
The largest ozone hole ever observed has opened up over Antarctica, a sign that ozone-depleting gases churned out years ago are just now taking their greatest toll, NASA scientists reported. This year's South Pole ozone hole spreads over about 11 million square miles, an area three times larger than the land mass of the United States.
February 7, 2001 | From Times staff and wire reports
Many more children stay home sick from school when ozone air pollution levels rise, according to a USC study. For every rise in ozone levels by 20 parts per billion, absences from school increased 83% because of respiratory illness such as sneezing, sore throats and coughs, according to the study. Ozone can average 30 ppb in the Los Angeles Basin, and levels on a smoggy day can exceed 100 ppb.
October 9, 1989 | From Times staff and wire reports
Depletion of the Earth's life-protecting ozone layer goes on with or without sunshine, during the Arctic winter as well as spring, Italian scientists report. Researchers have known since 1984 that a "hole" in the ozone layer, the atmospheric stratum that shields the Earth from the sun's lethal ultraviolet rays, appears in September over the South Pole. The hole is caused by a chemical reaction set off by the spring sunshine.
August 16, 2003 | From Times Staff and Wire Reports
A satellite designed to monitor the depletion of the ozone layer was launched from an airplane off the California coast. The Canadian Space Agency's Scientific Satellite is designed to last two years, orbiting Earth 15 times a day. The 330-pound satellite, attached to a rocket, was dropped from the belly of a plane. The satellite's instruments are designed to improve understanding of the depletion of the ozone layer, with an emphasis on changes occurring over Canada and the Arctic.
August 29, 1991 | From Associated Press
National Aeronautics and Space Administration officials said they will try to launch the shuttle Discovery on Sept. 12 to lift a satellite designed to collect data on the ozone layer and other components of the upper atmosphere. Mission managers set the date Wednesday, after a daylong flight-readiness review. The shuttle flight, NASA's 43rd, is to lift off at 3:57 p.m. PDT. Discovery is to land at Kennedy Space Center early on Sept. 18.
January 4, 1988
The earth's protective ozone layer has been thinning out around the world, not just over the South Pole, according to a new analysis of satellite data that was promptly disowned by the government agency that sponsored the study. Writing in the latest edition of the widely respected Science magazine, Kenneth P.
November 27, 1987 | United Press International
The mysterious hole in the ozone layer over Antarctica is caused by a chemical reaction involving chlorine from gases used as propellants and refrigerants, scientists confirmed Thursday. The chemical reaction is possible only in the presence of polar clouds, composed of tiny ice crystals, and the amount of sunlight that reaches the South Pole area in the late winter and early spring, scientists wrote.
June 30, 1990 | WENDY PAULSON
The City Council this week approved its first exemptions to companies affected by a law barring the use of chlorofluorocarbons and similar chemicals tied to the destruction of the Earth's ozone layer. Exemptions were granted to 27 companies, including many high-tech firms that use the chemicals, known as CFCs and TCAs, commonly found in solvents, coolants, degreasers, foaming agents, inks, plastic packaging materials and some medical equipment.
March 8, 1989 | LARRY B. STAMMER, Times Environmental Writer
A major international environmental conference ended here Tuesday after 13 more nations agreed to join a global accord to save the Earth's ozone layer from destruction by harmful chemicals. Their commitment to reduce the consumption of those chemicals by 50% by the turn of the century came in the wake of a drive by major industrial countries, including the United States, to go even further by totally banning the chemicals by the year 2000.
June 1, 2011 | By Amanda Mascarelli, HealthKey
Along with the lazy and often hazy days of summer come some not-so-pleasant health risks from exposure to air pollution. Ed Avol, a professor of preventive medicine at the Keck School of Medicine at USC, has been studying the links between respiratory health and air pollution for 35 years. In this edited interview conducted May 19, Avol spoke about the factors that can lead to poor air quality during the summer months and how people can limit their exposure to pollution. What factors make pollution so severe in the summertime?
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