Step 3. Apply the component specific RRFs to observed air quality to obtain projected

quarterly species estimates.

For each quarter, multiply the current quarterly mean component concentration (step 1) times the

component-specific RRF obtained in step 2. This leads to an estimated future quarterly mean

concentration for each component. (e.g., 3.0 ug/m3 sulfate x 0.800 = future sulfate of 2.4 ug/m3).

Step 4. Calculate a future year annual average PM2.5 estimate.

Sum the quarterly mean components to get quarterly mean PM2.5 values. Then average the

quarterly mean PM2.5 concentrations to get a future year annual average PM2.5 estimate for each

FRM site.

Compare the projected average annual arithmetic mean PM2.5 concentration obtained in Step 4

with 15.0 :g/m3. If all values are < 15.0 :g/m3, the test is passed.

5.1.1 What Ambient PM2.5 Data is Used in the Attainment Test?

PM2.5 data collected at FRM sites is used for nonattainment designations. Therefore we

 

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