- mass associated with sulfates

- mass associated with nitrates

-mass associated with ammonium

- mass associated with organic carbon

- mass associated with elemental carbon

-mass associated with particle bound water

- mass associated with “other”primary inorganic particulate matter

-and passively collected mass

To apply the test, States must first have run an air quality model at least twice--to

simulate current emissions and to simulate future year emissions. We recommend a modeled

attainment test which has 4 basic steps. Additional details are provided later in this section.

Step 1. Compute observed quarterly mean PM2.5 and quarterly mean composition for each


Derive current quarterly mean concentrations37 for each of the major components of PM2.5. This

is done by multiplying the monitored quarterly mean concentration of Federal Reference Method


37Concentrations should be calculated based on calendar quarters for two reasons. First,

the NAAQS is calculated for a calendar year, so the quarters need to fit evenly within a year.

Second, the monitored data used to calculate design values is averaged on a calendar quarter

basis before calculating annual averages.


n601 - n602 - n603 - n604 - n605 - n606 - n607 - n608 - n609 - n610 - n611 - n612 - n613 - n614 - n615 - n616 - n617 - n618 - n619 - n620 - n621 - n622 - n623 - n624 - n625 - n626 - n627 - n628 - n629 - n630 - n631 - n632 - n633 - n634 - n635 - n636 - n637 - n638 - n639 - n640 - n641 - n642 - n643 - n644 - n645 - n646 - n647 - n648 - n649 - n650


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