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Predicted Levels Compared to Monitor Data

COMPARISON OF 1996 NATA RESULTS TO MEASURED CONCENTRATIONS IN OUTDOOR AIR IN NEW JERSEY

There are four established air toxics monitoring sites run by NJDEP. They are located in Camden, Elizabeth, New Brunswick and Chester. The Camden site has been measuring several toxic volatile organic compounds (VOCs) since 1989. The Elizabeth site began measuring VOCs in 2000, and the New Brunswick and Chester sites became operational in July 2001. In July 2001, analysis for toxic metals also began at all four sites.

NJDEP Air Toxics Monitoring Sites
NJDEP Air Toxics Monitoring Sites

Thirteen of the toxics measured at the Camden monitoring site were included in the NATA study, although three of them fell below detection limits in 1996, so there is no measured level in that year. For the remaining 10 toxics it is possible to compare the levels predicted by NATA at this site to the levels that were actually measured. The comparisons are in the figure below. It appears from this analysis that the agreement between predicted and monitored concentrations are remarkably good. (For the majority of these pollutants the predicted and observed values are within a factor of two of each other.)

Measurements in Camden during 2000 show that levels of all these compounds have been reduced since 1996.

Air Toxics Levels Measured in 1996 at Camden, New Jersey
Compared to NATA Predicted Levels

Air Toxics Levels Measured in 1996 at Camden, New Jersey
Compared to NATA Predicted Levels

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