Refrigerant handling and use requires a great deal of knowledge. Refrigerant is a hazardous chemical that requires handlers be certified in the use and knowledge of EPA regulations. This was all introduced with The Clean Air Act of 1990 specifically the section of Protecting the Stratospheric Ozone Layer.
“Ozone can be good or bad depending on where it is located. Close to the Earth's surface, ground-level ozone is a harmful air pollutant. Ozone in the stratosphere, high above the Earth, protects human health and the environment from the sun's harmful ultraviolet radiation. This natural shield has been gradually depleted by manmade chemicals. So in 1990, Congress added provisions to the Clean Air Act for protecting the stratospheric ozone layer.
Ozone in the stratosphere, a layer of the atmosphere located 10 to 30 miles above the Earth, serves as a shield, protecting people and the environment from the sun's harmful ultraviolet radiation. The stratospheric ozone layer filters out harmful sun rays, including a type of sunlight called ultraviolet B. Exposure to ultraviolet B (UVB) has been linked to cataracts (eye damage) and skin cancer. Scientists have also linked increased UVB exposures to crop injury and damage to ocean plant life.
In the mid-1970s, scientists became concerned that chlorofluorocarbons (CFCs) could destroy stratospheric ozone. At that time, CFCs were widely used as aerosol propellants in consumer products such as hairsprays and deodorants, and as coolants in refrigerators and air conditioners. In 1978, the U.S. government banned CFCs as propellants in most aerosol uses.
Scientists have been monitoring the stratospheric ozone layer since the 1970s. In the 1980s, scientists began accumulating evidence that the ozone layer was being depleted. The ozone hole in the region of the South Pole, which has appeared each year during the Antarctic winter (our summer), often is bigger than the continental United States. Between 1978...