1. Options available to model capped and horizontal point sources directly in AERMOD 2. For scenarios without downwash, results are nearly identical to previous parameterizations 1. POINTCAP results in higher concentrations than POINTHOR with all else equal 2. POINTCAP includes stack tip downwash whereas POINTHOR does not 3. With downwash, prior parameterizations were very conservative 1. Particularly pronounced conservatism for stacks with warm exhaust 2. Conservatism is less pronounced with less downwash 3. Increasing flow rate for POINTCAP or POINTHOR stack could result in increased concentrations due to PRIME parameterization.
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