components of particulate matter has a substantial effect on the extinction coefficient calculated

with Equations (6.1) or (6.2). If it does, and diagnostic tests (also described in Section 18) are

unable to resolve a performance problem, a State may need to address the goal for “best”

visibility days in the particular Class I area(s) without using results from a grid model.

8.0 What Additional Analyses and Data Collection Can Be Completed to

Assess Progress towards Attainment

The purpose of an attainment demonstration is to provide a best estimate as to whether

the control measures included in a State Implementation Plan will result in attainment of the

NAAQS by a specific date in the future. In most cases, it will be desirable to periodically track

the air quality improvements resulting from the SIP to ensure that the plan is going to result in

attainment by the appropriate dates. One possible tracking approach is a mid-course review

(MCR). Also, the regional haze rule requires periodic tracking of progress towards visibility

goals (every 5 years). In this section, we identify measurements and activities which will

provide better support for mid course reviews, future modeling exercises and other supplemental

analyses designed to determine the progress toward attainment of the NAAQS or reasonable

progress goals. Improved data bases will increase the reliability of reviews and enable

identification of reasons for attainment or non-attainment of the NAAQS.

Deploying additional air quality monitors. One type of additional monitoring which

should be considered has already been mentioned in Section 3. Additional ozone and/or PM2.5

monitors should be deployed in unmonitored locations where future design values are predicted

to exceed the NAAQS via the unmonitored area test. This would allow a better future

assessment of whether the NAAQS is being met at unmonitored locations. Also, additional PM

speciation monitors should be deployed in areas that are expected to continue to exceed the

NAAQS in the future (particularly if there is not a speciation monitor at the highest FRM sites in

a nonattainment area). Additional ambient data can provide an increased understanding of the

nature of the problem, which can help lead to the most cost efficient solution.


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