Surface ozone at College, Alaska, for the year 1950

The daily average concentrations of ozone in the atmosphere near the surface at College, Alaska (latitude 65°N, longitude 148°W), were determined during 1950 by the absorption of ozone in a solution of potassium iodide and standard sodium arsenite. The results, which were generally higher and more erratic than those found at lower latitudes, ranged from one to 75 mg/100 of dry air at standard conditions to give a yearly average of 9.8 mg/100 m3 (or 4.6 × 10−8 molecules of ozone per molecule of air). The monthly averages showed a principal maximum in April, a secondary maximum in July, and a minimum in August.