Intercomparison of Ozone Measurements in the Framework of the Project Proposal "Alpine Ozone Assessment"
Intense photochemical pollution episodes observed in the warm season in alpine region have promoted the setting up of a working group to collect and analyse ozone data. To ensure comparable data, a second intercomparison of ozone measurements took place in May 1995 and at the JRC Ispra; twelve laboratories from Austria, Germany, Switzerland, Slovenia, Italy and France took advantage of the European Reference Laboratory of Air Pollution (ERLAP) facilities for that exercise. The results are presented in this report. The intercomparison showed that 13 out of 16 different monitors measured ozone concentrations in good agreement with the ERLAP standard values. Except for the lowest level (4 parts per billion (ppb)), for which the accuracy is largely influenced by the instrumental noise, all other values were within 2% of the standard value. This represents a considerable improvement when compared to the first intercomparison campaign (May 1994) where the values were within 7% of the standard value. Interferences of water vapour on the instrumental response have been observed for almost all analysers, particularly at the lowest ozone level (35 ppb).
Bibliographic Reference: EUR 16361 EN (1996) 30pp., FS, free of charge
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT)
Record Number: 199610438 / Last updated on: 1996-05-20
Original language: en
Available languages: en