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[FAQ] 70 [Keywords] Road Pollutant Modelling NO2 NOX nitrogen Bias Traffic tools calculator [Published Date (sort)] 19/06/2014 [Sort by Title] 
The NOX to NO2 calculator asks me (under General Inputs - step 4) to specify the traffic mix. Which option should I choose?
LAQM FAQs - Local Air Quality Management Support - Defra, UK
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