Step 5. Sum the quarterly components to get quarterly “potential” 98th percentile PM2.5
Sum the quarterly components to get quarterly “potential” 98th percentile PM2.5 values. Repeat
this procedure for each quarter and for each of the 5 years of ambient data. The highest daily
value (from the 4 quarterly values) for each year at each monitor is considered to be the
estimated 98th percentile value for that year.
Step 6. Calculate future year 5 year weighted average 24-hour design values and compare
to the NAAQS.
The estimated 98th percentile values for each of the 5 years are averaged over 3 year intervals
to create design values and then the 3 design values are averaged to create the 5 year weighted
average for each monitor. Compare the projected 24-hour design values to 65 ug/m3.
The recommended test is illustrated in example 5.2. In the interest of brevity, some of the steps
are only illustrated for quarter 1. The actual calculations would also use analogous data for the
other three quarters.
Given: (1) Area “D” has 1 monitoring site. The 98th percentile values for 5 years of observed
data are as follows (year 3 is being modeled for the attainment test):
Year 1- 80 ug/m3
Year 2- 68 ug/m3
Year 3- 71 ug/m3
Year 4- 58 ug/m3
Year 5- 74 ug/m3
Step 1- Compute observed 98th percentile values for each year and next highest
concentrations for each quarter.
The maximum quarterly values from the 5 years which are equal to or less than the 98th
percentile concentration are as follows:
n651 - n652 - n653 - n654 - n655 - n656 - n657 - n658 - n659 - n660 - n661 - n662 - n663 - n664 - n665 - n666 - n667 - n668 - n669 - n670 - n671 - n672 - n673 - n674 - n675 - n676 - n677 - n678 - n679 - n680 - n681 - n682 - n683 - n684 - n685 - n686 - n687 - n688 - n689 - n690 - n691 - n692 - n693 - n694 - n695 - n696 - n697 - n698 - n699 - n700
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