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
Sun goddess of the Earth she is mostly attested in curses, oaths, and purification rituals. The Sun goddess of the Earth was worshipped in various places in the Hittite Empire, such as , A(n)galiya near , Ankuwa, Nerik, and Zippalanda. Her worship is also attested in the land of Kizzuwatna. Sun goddess of the Earth The Sun goddess of the Earth (Hittite: "taknaš UTU", Luwian: tiyamaššiš Tiwaz) was the Hittite goddess of the underworld. Her Hurrian equivalent was and her Sumerian/Akkadian equivalent was Ereshkigal, both of which had a marked influence on the Hittite goddess from an early date. In the Neo-Hittite period, the Hattian