Note the reactions labeled 1, 2 and 3 in the diagram. All three of these reactions occur at all times during daylight hours. Reaction 1 which is driven by sunlight creates ozone, while reactions 2 and 3 consume ozone. Reaction 3 depends on NOx to do its job. In certain cases if NOx levels are reduced less ozone is consumed by reaction 3, and reaction 1 drives ozone levels higher. These higher levels of ozone are called the "disbenefits"of NOx reduction.

Dr. David Wojick, PE (540) 858-3503

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