The SUM06 is the sum of the ozone concentrations for every hour that exceeds 0.06 parts per million (ppm) within a 12-hour period from 8 am to 8 pm in the months of May to September.
274610
The SUM06 is the sum of the ozone concentrations for every hour that exceeds 0.06 parts per million.
274611
The SUM06 is the sum of the ozone concentrations for every hour that exceeds 0.78 parts per million.