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.
The SUM06 is the sum of the ozone concentrations for every hour that exceeds 0.06 parts per million.
Two men are decked out in full competition gear, one in yellow and the other in red, with helmets and all competing in a cycling race.