What meteorological (met) data will be approved and/or required to be used for ISC3 or AERMOD modeling?
Response: The District has posted met data files for 1990 to 1994 on the District’s web site at “http://www.louisvilleky.gov/APCD/STAR/MetData.htm”. The District has confirmed that these files will run in the ISC3 model, and will use these 1990 to 1994 met data files when using the ISC3 model. The District has evaluated the significance of using the 1986 to 1990 five-year met data set that was submitted by a local consulting firm. In general, this 1986 to 1990 met data set resulted in similar, but slightly higher, concentrations than were calculated using the 1990 to 1994 met data set posted on the District’s web page. Thus, the District approves the use of this specific 1986 to 1990 met data set. The use of any other met data set for modeling submitted to the District will require evaluation and approval by the District. The District will be working with the Kentucky Division for Air Quality and EPA Region 4 to develop a five-year met data set that is formatted for use in AERMOD.
