Ozone vacuum-ultraviolet (VUV) ozone generators, employ a light source that generates a narrow-band ultraviolet light, a subset of that produced by the Sun. The Sun's UV sustains the ozone layer in the stratosphere of Earth. UV ozone generators use ambient air for ozone production, no air prep systems are used (air dryer or oxygen concentrator), therefore these generators tend to be less expensive. However UV ozone generators usually produce ozone with a concentration of about 0.5% or lower which limits the potential ozone production rate. Another disadvantage of this method is that it requires the ambient air (oxygen) to be exposed
High Roller (Stratosphere) High Roller (Stratosphere) The High Roller (also known as the Let it Ride High Roller), was a steel roller coaster constructed on top of a building over the Las Vegas Strip. It was the highest roller coaster in the world when compared to the surrounding terrain. It was located on top of the Stratosphere Tower, Las Vegas, Nevada, which is the tallest free-standing observation tower in the United States. The coaster was manufactured by S&MC GmbH Structures and Machines. The ride opened on April 29, 1996, in a special VIP gala opening, one day before the ride and casino opened