Solme Robust Statistical Procedures and Their Application To Air Pollution Data

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Abstract
Robust methods for estimation location and fitting principal components are used to investigate the production and origin of the air pollutant, ozone, within the New York City—Northern New Jersey region. Distributions of daily maximum ozone concentrations at five sites, three of them in highly urbanized areas and two of them in nonurban areas, are very similar. The differences in concentration which do exist, occur at hours other than those when maxima occur, and appear to be largely a result of differing levels of local emissions of nitric oxide, which reduces the ozone concentrations locally. These results suggest that it is unlikely that a reduction of emissions within the New York area alone would have the potential to reduce ozone concentrations within the area itself by a significant factor.