Meteorological DataContact: Jim Haywood, 517-241-7478Agency: Environmental Quality
The meteorological data support document includes a station map showing the locations of our 72 available meteorological (met) stations. Hourly met data is collected at all stations and 29 of the stations also collect one-minute met data. This document includes a table with links to ZIP files which contain canned one-minute and hourly met data that can be used when performing dispersion modeling with AERMOD. Each ZIP file includes a five-year dataset (2013-2017) with both Surface Met Data and Profile Met Data. USEPA recommends the use of one-minute met data for input in dispersion modeling. Their reasoning is that hourly average winds calculated with the one-minute meteorological data are more reflective of actual conditions as opposed to the single two-minute observation used with the hourly met data.
AERMOD is now the preferred USEPA regulatory dispersion model; therefore, only meteorological data to be used with AERMOD is available for download from this site.
When performing regulatory modeling for a stationary source, it is important to use data from the station most representative of conditions at the source location. The representativeness of a station is often measured by proximity. However, proximity alone does not guarantee that a particular station is the most representative station available. The AQD can be consulted to help identify which station is the most representative for a specific modeling demonstration.