Methods:
We will deploy a new instrument developed in Mines Douai (France) to measure ozone production rates in undisturbed air masses as well as air masses perturbed by an addition of NOx. Complementary instruments will also be deployed to measure important ozone precursors: 2 online gas chromatographs for VOCs and an OH reactivity instrument based on the Comparative Reactivity Method. This set of measurements will be used to model ozone production using box modeling for comparison with the measurements.