(The dry efficiency is a consensus value based on Trijonis et

al. (1987) and the relative humidity correction factor is based

on Tang et al. (1981).)

a. It is only appropriate to compute the extinctions

based on hourly values of [part] and relative

humidity. It is not appropriate to use average

values of these quantities.

b. To calculate the extinction due to primary fine

particulate, use the above equation, but set the

relative humidity correction factor (f(RH)) equal to

1.

Example

If one has a sulfate concentration [SO ] of 1.7 μg/m , then = 3

4

this would correspond to an ammonium sulfate concentration

[(NH ) SO ] of 2.34 μg/m . The extinction due to this 4 2 4

3

concentration would be 0.003×2.34×f(RH) km . From Figure B-1, -1

if the relative humidity is 95%, f(RH) is 11.5. Therefore

b = 0.08 km .

 

 

 

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