Hydrogen peroxide and ozone over the northeastern United States in June 1987

The atmosphere was sampled at various elevations from minimum altitude above ground level up to 4 km above sea level, over the northeastern United States between Columbus, Ohio, and Saranac Lake, New York, during June 1987. The average O₃ concentrations, calculated for constant-altitude flight segments, are in the range 50-110 ppbv; the H₂O₂ range for the same flight segments is 0.6-3.6 ppbv. Concentration profiles of O₃ show little variation with altitude, with the exception of samples taken in polluted areas. the highest H₂O₂ concentrations are observed at the lowest altitudes in air from southern regions, i.e., in air containing the greatest water vapor density. The concentrations of both O₃ and H₂O₂ show a clear decrease from lower (40°N) to higher (44°N) sampling latitudes. -from Authors