The Working Group did not however, recommend an alert thresholds for NO2. . This

was because it was felt that an alert threshold value should be the same as the limit

value as the latter is based upon lowest observed effect level. Also short term

measures to reduce concentration, for example by restricting traffic, are unlikely to be

effective because NO2 is mainly a secondary pollutant. The Working Group therefore

recommended the provision of better information to the public, when the short term

limit value is exceeded, see chapter 3.6.

 

 

 

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