In each monitoring station, on-line
analyzers were used to monitor continuously various air
pollutants and the data recordedfor sessions of hourly, daily
(weekday), weekend and monthly. The system provides four types of selectable data: momentary values, integrated values,
moving averages and simple averages. Automatic compensation
for ambient pressure assures reliable data regardless of the
weather or the monitoring location. The influence from
interference components is minimal and results are very stable
over long periods of measurement. In addition, both ambient air
monitoring and traffic flowcounting were determined
simultaneously over 24-hour periods and was used to identify the
rush and non-rush periods.