THE ONGOING CHALLENGE OF MANAGING CARBON MONOXIDE POLLUTION IN FAIRBANKS, ALASKA: Interim Report by National Research Council

Author:National Research Council
Language: eng
Format: epub
Tags: Environment and Environmental Studies: Pollutants and Toxics
Publisher: NATIONAL ACADEMY PRESS
Published: 2002-08-22T00:00:00+00:00

Most of the variables showed near-normal distributions, but the distribution of CO concentrations was right-skewed and followed a lognormal distribution approximately. Accordingly, the variable was transformed to log(CO +0.1).8 Table 2–5 shows the correlation matrix for the seven variables. Log(CO+0.1) has the strongest correlation with windspeed (negative, as expected) and moderate correlations with inversion strengths and traffic (all positive, as expected); low and high inversion strengths are strongly and positively correlated with one another, as might be expected.

8The value 0.1 ppm was added to the observed 1-h CO concentration to allow the logarithmic transformation to be taken when the CO concentration was observed to be zero. The distribution of log(CO+0.1) is approximately normal.

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