The monitoring of NO2 for regulatory purposes requires methods suitable measuring

concentrations in the range relevant for Europe, i.e. 0 - 500 mg/m3, with a sufficiently

high accuracy. There are several well-established monitoring methods for NO2 in this

concentration range, some of which can only measure NO2, while others can also

measure NO and/or NOx. A list of methods for NO2 measurements has been prepared

by JRC and is presented in Annex III. The list includes references to the methods as

well as brief comments on their advantages and disadvantages. The methods differ

with respect to chemical and technical principle as well as to temporal and spatial

resolution. In some situations, only one monitoring method may be feasible, but where

a choice of method is possible, the advantages and disadvantages of different methods

need to be considered.

The most commonly used methods are briefly described below. Distinction is made

between continuous and discontinuous methods, and between point measurements and

remote sensing. The point measurements are representative for the monitoring site and

for an area around the site, the size being determined by the emissions and other

characteristics of the surroundings. The remote sensing methods measure the average

concentration over the monitoring path in the atmosphere. Variation along the path is

not detected.

Many other methods are available. However, only standardised and reliable methods

should be used for environmental monitoring.


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