Article from 25.05.2021 | Last changed: 25.05.2021
Ozone
… Ozone Ozone is a colourless and toxic gas, and one of the most important trace gases in the atmosphere. The natural ozone layer … daily 8-hour mean of 120 µg/m 3 is established. This value is not to be exceeded on more than 25 days per calendar year. The long-term objective is a maximum daily …