Step 2- Identify the species composition for each quarter for each monitor.

The mean species composition55 for the observed high PM2.5 days in quarter 1 is:

Nitrate- 30%

Sulfate- 10%

Organic carbon- 23%

Elemental carbon- 5%

Other primary PM2.5- 5%

Ammonium- 15%

Water- 12%

This leads to the following baseline concentrations for quarter 1 (ug/m3):

Step 3- Using model results, derive component-specific relative response factors (RRF) at

each monitor for each quarter.

The following are RRFs for the 1st quarter derived from the modeled baseline and future year

concentrations for the high PM2.5 days.

55The percentages are derived from several steps in the processing. The nitrate, sulfate,

elemental carbon, and other primary PM2.5 are derived from measured or interpolated data. The

ammonium is calculated from interpolated sulfate, nitrate, and DON (or directly interpolated

ammonium). Water is calculated from ammonium, nitrate, and sulfate using a model or

equation. The OMC is calculated by mass balance.

 

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