AOT40
AOT40 stands for A ccumulated O zone exposure over a t hreshold of 40 parts per trillion , cumulative ozone levels above the limit of 40 ppb ' . It is a dose measure for evaluating the ecotoxicological effects of ozone on vegetation. The value was introduced in 1992 at the UN ECE workshop in Egham (UN ECE 1992).
AOT40 is expressed in (µg / m³) · h. The value indicates the cumulative difference between the measured 1-hour mean value over 80 μg / m³ and 80 μg / m³ during a given period of time. Only measured values between 8 a.m. and 8 p.m. during the growing season are used. Since 80 μg / m³ corresponds to 40 ppb, the value is called AOT40.
Web links
- Environmental Atlas Hesse
- Effects of ozone on ecosystems on the part of the Federal Environment Agency
- Target values and long-term goals for ozone, Federal Ministry of Justice
Individual evidence
- ↑ Assessment criteria for the most important air pollutants ( Memento of the original from May 24, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. on the side of the State Office for Nature, Environment and Consumer Protection of the State of North Rhine-Westphalia
- ↑ Directive 2008/50 / EC of the European Parliament and of the Council of May 21, 2008 on ambient air quality and cleaner air for Europe .
