We obtained model predictions from each model by generating the covariates at locations of interest (either monitoring locations for model evaluation or grid locations for display purposes) for each month, and then transforming to the native scale by exponentiation.
We compiled 3-year averages for ambient measurement of air toxics collected at monitoring locations in the United States from 2003 through 2005.
On one hand, strong sources of SO2 emissions, such as gas plants, seem obvious candidates, but they are less numerous and farther away from monitoring locations than wells and batteries.
The responding displacement at monitoring locations ranged from 1 mm to 11 mm under the first two resonant frequencies.
Daily concentrations of six criteria air pollutants were downloaded from the AQS [ 16] and temporally averaged to get annual mean concentrations for each monitor location from 2000 to 2005.
Chloride concentrations exceeded USEPA water-quality criteria at 55% (chronic) and 25% (acute) of the 168 monitoring locations in northern metropolitan areas from November to April.
We compiled ambient monitoring data from hundreds of monitoring locations to create the most complete data set of air toxics measurements.
A city-wide time series was then derived from the five remaining monitoring locations, including data from four of five NYC boroughs - two in the Bronx (hereafter referred to as "Bronx A" and "Bronx B"), one in Manhattan, one in Queens, one in Staten Island.
For studies where the cohort is located much further from monitoring locations, this would likely be a larger source of error.
That assignment method may raise a number of issues, given that the variance of pollutant measurements can differ from monitoring location to monitoring location and given the difference between ambient monitoring results and personal exposure level to O3.
The limitation of this study was that outdoor air pollution data were from fixed monitoring locations.
