- how to estimate base period air quality in a Class I area without monitored data;

- how to handle a base year without data or with a small sample size;

- how to consider a day with missing data for one or several components of PM;

- use of the same days to estimate changes in visibility for the worst days and a different set of

same days to estimate changes in visibility for the best days;

- which predictions to use to derive relative response factors;

- how many and what kind of days to use to develop RRF values

- use of relative response factors which are specific for days with poor vs. days with good

visibility

-alternative RRF calculations

Estimating baseline “worst” and “best” visibility in a Class I area without monitors.

There are 156 Class I areas and there are 110 IMPROVE sites in or near Class I areas.

Therefore, approximately 46 Class I areas do not have co-located IMPROVE monitors. EPA’s

“Tracking Guidance” recommends using IMPROVE data from a nearby site to represent the

visibility at each Class I area that does not have ambient data. Table A-2 in Appendix A (of the

 

 

n701 - n702 - n703 - n704 - n705 - n706 - n707 - n707 - n709 - n710 - n711 - n712 - n713 - n714 - n715 - n716 - n717 - n718 - n719 - n720 - n721 - n722 - n723 - n724 - n725 - n726 - n727 - n728 - n729 - n730 - n731 - n732 - n733 - n734 - n735 - n736 - n737 - n738 - n739 - n740 - n741 - n742 - n743 - n744 - n745 - n746 - n747 - n748 - n749 - n750

 

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