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Background Concentrations


For some pollutants in the 1999 NATA, USEPA included in the estimated total average ambient air concentrations a contribution from what it calls “background.”  These are concentrations of the pollutants that are not accounted for by the emissions inventory.  They are attributable to long-range transport, unidentified emission sources, and natural emission sources.  A detailed description of how USEPA came up with these “background concentrations” can be found on USEPA’s NATA web site.


Table 1.  Source Category Contributions to Risk Ratios

For chemical-specific health effects information, click here.


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