If the concentrations are low, a combination of measurements and models may be

used in non-agglomerations. A combined use of measurements and models may also

reduce the monitoring need in agglomerations .

The FWD also states the requirements for the assessment of air quality, such as design

of monitoring programmes, requirements of the methods to be used etc.

There are several reasons for assessing nitrogen oxides in the air, the most important

being to identify the levels of NO2 in areas where people are likely to be exposed, and

to identify areas where air quality standards are exceeded. For the abatement of

pollution, the identification of major sources is necessary, as well as monitoring the

effectiveness of applied abatement strategies.

Due to the close relationship between NO and NO2, both should however be

measured, to provide a basis for abatement strategies. It is also useful to measure O3 in

connection with the measurements of nitrogen oxides due to the "titration" of NO.

Recommendations for monitoring O3 will be included in a future position paper for

O3.

 

 

 

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