Community Research and Development Information Service - CORDIS


The concentration of ozone in the troposphere has been increasing in the northern hemisphere by 0.5 to 3 % a year. Since the pre-industrial era the average levels of ozone in this hemisphere have increased by a factor of two to three, both on the surface and in the troposphere. The seasonal level of ozone concentration has been changing gradually; the high levels once recorded in the spring have been replaced by a new high between the months of May and September. The discussion in this report aims to provide an explanation of the role of nitrogen oxides in the context of pollution by photo-oxidants.

Additional information

Authors: RESTELLI G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Convegno nazionale inquinamento aria e techniche di riduzione, Rubano (IT), December 2-3, 1993
Availability: Available from (1) as Paper IT 38005 ORA
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