Of the primary air pollutants monitored by the EPA,which one is found above recommended levels in more U.S.counties than any other?

Question

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Ozone is found above the recommended levels in more U.S. counties than any other primary air pollutant monitored by the EPA. This is largely due to its formation from a reaction between nitrogen oxides and volatile organic compounds in the presence of sunlight, which can occur in urban and suburban areas with high vehicle traffic and industrial activity. Ozone can cause a range of health problems, including respiratory issues like chest pain, coughing, and shortness of breath.

Of the Primary Air Pollutants Monitored by the EPA,which One