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New Hampshire Department of Environmental Services

Air Quality Modeling Program
AERMOD Dispersion Model – Input Data

NHDES has compiled and published these data to assist sources and consultants in performing air dispersion modeling. The input data published below will be appropriate for the majority of modeling projects and will typically be accepted by NHDES without additional justification. However, modeling procedures also allow for alternate input data in many situations. Sources who elect to use input data that varies from the data published here should include in the modeling protocol a demonstration that the alternate data is appropriate for the project and describe the methods used to develop the data. NHDES encourages sources who propose to use alternate data to contact NHDES early in the permitting process.

Refined 2008-2012 Meteorological Data
Pre-processed five year (2008-12) meteorological data sets were generated using 1-minute observation data from seven National Weather Service (NWS) Automated Surface Observing System (ASOS) stations across New Hampshire. Observation data at the NWS site in Portsmouth is collected on an hourly basis. The data sets processed for refined (sequential) AERMOD model runs are available from the NHDES FTP server which can be accessed at A user name and password are NOT required to download files.

The following surface and profile data sets are available for download:

The NH Meteorological Zone Map Adobe Acrobat Reader Symbol was developed as a guide for the selection of meteorological data for permit modeling using AERMOD. Please note that when available, a minimum of one year of on-site meteorological data is typically preferred.



Adobe Acrobat Reader Symbol Adobe Acrobat Reader format. Download a free reader from Adobe.

Microsoft Word Symbol Microsoft Word format. Download a free viewer from Microsoft.

Rich Text Format symbol ZIP Format (.zip). Visit for a list of free .zip readers for a variety of operating systems.

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