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DPT |
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ti]( ) are smooth functions of time, temperature, and dew point temperature with the indicated degrees of freedom (the smooth functions are represented using natural cubic splines); [temp. Because the acute effects analysis assessed shorter-term changes in pollution levels, we considered covariates such as temperature and dew point temperature (a measure of relative humidity), which also change over short periods of time. The temperature and dew point temperature are 24-hr averages of hourly observations taken at O'Hare International Airport (Chicago, IL). |
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