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When setting the limit value and, as appropriate, alert threshold, the following factors may, by way of example, be taken into account:
degree of exposure of sectors of the population, and in particular sensitive sub-groups,
climatic conditions,
sensitivity of flora and fauna and their habitats,
historic heritage exposed to pollutants,
economic and technical feasibility,
long-range transmission of pollutants, of which secondary pollutants, including ozone.
size of exposed population, living resources or ecosystems,
existence of particularly sensitive targets in the zone concerned.
The pertinent danger criteria established under Directive 67/548/EEC(1) and its successive adaptations must be taken into account in the selection of the pollutants.
region
city (map)
measuring station (map, geographical coordinates).
type of zone (city, industrial or rural area)
estimate of the polluted area (km2) and of the population exposed to the pollution
useful climatic data
relevant data on topography
sufficient information on the type of targets requiring protection in the zone.
Names and addresses of persons responsible for the development and implementation of improvement plans.
concentrations observed over previous years (before the implementation of the improvement measures)
concentrations measured since the beginning of the project
techniques used for the assessment.
list of the main emission sources responsible for pollution (map)
total quantity of emissions from these sources (tonnes/year)
information on pollution imported from other regions.
details of those factors responsible for the excess (transport, including cross-border transport, formation)
details of possible measures for improvement of air quality.
local, regional, national, international measures
observed effects of these measures.
listing and description of all the measures set out in the project
timetable for implementation
estimate of the improvement of air quality planned and of the expected time required to attain these objectives.
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OJ No 196, 16.8.1967, p. 1/670. Directive as last amended by Commission Directive 91/632/EEC (OJ No L 338, 10.12.1991, p. 23)