STATISTICAL SUMMARY OF AIR-QUALITY DATA FOR METROPOLITAN CLEVELAND, OHIO, 1967-1972: TOTAL SUSPENDED PARTICULATES, NITROGEN DIOXIDE, AND SULFUR DIOXIDE

摘要

Air-quality data for metropolitan Cleveland, Ohio, from 1967 through 1972 have been collated and statistically analyzed. Total suspended particulates (TSP), in contrast with previous years, departed from lognormal distribution in 1972. Nitrogen dioxide and sulfur dioxide, although only somewhat lognormal in previous years, also departed significantly from lognormal distribu¬tions in 1972. Nowhere in Cleveland were the Ohio standards met. However, all Lewis-operated western suburban stations, except one, met the annual mean standard for TSP, but state-operated suburban stations did not. The data indicate a general improvement in air quality;unusually high precipitation (43 percent above normal in 1972) may have been the major factor in lowering these values from 1971 levels. The mean values of TSP, NO2， and SO2 were 104, 191, and 83 ug/m³ respectively.