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Ozone is a gas. It can be good or bad, depending on where it is. "Good" ozone occurs naturally about 10 to 30 miles above the Earth's surface. It shields us from the sun's ultraviolet rays. Part of the good ozone layer is gone - destroyed by man-made chemicals. Without enough good ozone, people may get too much ultraviolet radiation. This may increase the risk of skin cancer, cataracts and immune system problems.
"Bad" ozone is at ground level. It forms when pollutants from cars, factories and other sources react chemically with sunlight. It is the main ingredient in smog. It is usually worst in the summer. Breathing bad ozone can be harmful, causing coughing, throat irritation, worsening of asthma, bronchitis and emphysema, and even permanent lung damage, if you are regularly exposed to it.
Environmental Protection Agency
'''Ozone''' (O3) is an allotrope of oxygen, the molecule consisting of three oxygen atoms instead of the more stable diatomic O2. At standard temperature and pressure ozone is a blue gas. Ozone forms a dark blue liquid, below -112 °C, and a dark blue solid, below -193 °C. Ozone is a powerful oxidizing agent, and is unstable, decaying to ordinary oxygen through the reaction: 2O3 → 3O2. This reaction proceeds more rapidly with increasing temperature and increasing pressure. Ozone is a highly corrosive poisonous substance and a common pollutant. It has a sharp, pungent odor. It is present in low concentrations throughout the Earth's atmosphere. It is also formed from O2 by electrical discharges, e.g., lightning, and by action of high energy electromagnetic radiation. Some kinds of electrical equipment generate levels of ozone that a human can easily smell. This is especially true of devices using Voltage sparks and danger, such as television sets and photocopiers. Electric motors using brushes can generate ozone from repeated spark gaping inside the unit. Large motors, such as those used by elevators or hydraulic pumps, will generate more ozone than smaller motors. The highest levels of ozone in the atmosphere are in the stratosphere, in a region also known as the ozone layer. Here it filters out much ultraviolet light from the Sun that would be harmful to most forms of life. The standard way to express total ozone amounts in the atmosphere is by using Dobson units. Ozone used in industry is measured in Parts per million (OSHA exposure limits for example), and percent by mass or weight. Ozone was discovered by Christian Friedrich Schoenbein in 1840.
Swimming Pool by Francois Ozon - Director's official web site with movie stills and trailers.
Washington Post: What Lies Beneath - Critic Stephen Hunter calls the film "a master stroke from Francois Ozon."
BBC Films: Review - Swimming Pool - Charlotte Rampling plays an English crime novelist in this atmospheric English-language thriller from '8 Women' director Francois Ozon.
Chicago Sun-Times: Swimming Pool - Roger Ebert's positive take on Francois Ozon's mystery drama.
Salon.com: Swimming Pool - Stephanie Zacharek says "Sunshine, murder and Charlotte Rampling join forces in Francois Ozon's French-country-house thriller."
Rottentomatoes.com: Swimming Pool - Interview with director Francois Ozon, reviews from the top critics and audiences, movie info, trailer, poster, photos, news, articles, and forum.
Ozon, Francois - Official website of French director offering news, pictures, interviews and clips. French or English.
Highway 17 Theatres - Showtimes and ticket prices for this ozoner located in Dewy Rose.
Ozoner 29 & El Rancho Drive-In Theatres - Drive-in theatres located in Broadalbin and Palatine Bridge. Showtimes, menu prices, and coming attractions.
Hillcrest Drive In - Schedules, history and photos of this ozoner located in Surrey.