has easy to read information about Ozone and how it is harmful to humans
says "Manufacturers and vendors of ozone devices often use misleading terms to describe ozone. Terms such as "energized oxygen" or "pure air" suggest that ozone is a healthy kind of oxygen. Ozone is a toxic gas with vastly different chemical and toxicological properties from oxygen"
good ozone as "stratospheric ozone, good ozone occurs naturally in the upper atmosphere' and
bad ozone as "Tropospheric, or ground level ozone, is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC). This happens when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources chemically react in the presence of sunlight."
page 14 states "There is some evidence that long-term exposure to ozone may have chronic effects" and table 3 note says "Deaths attributable to ozone. Time-series studies indicate an increase in daily mortality in the range of 0.3–0.5% for every 10 µg/m3 increment in 8-hour ozone concentrations above an estimated baseline level of 70 µg/m3 ."
The limit of exposure to humans
US EPA (see table 1) recommends max. 0.08 ppm for 8 hours mean