DES 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 DES 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. DES encourages sources who propose to use alternate data to contact DES early in the permitting process.
- Background Air Quality Data
New Hampshire's most recent monitored background values for criteria air pollutants to be added to modeled impacts for evaluation against the ambient air quality standards are available upon request. Contact Lisa Landry at firstname.lastname@example.org to obtain air quality background data for specific areas in New Hampshire.
- NH Meteorological Data – Zone Map 2006-2010
- NH Meteorological Data – Profile Base Elevations
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 DES FTP server which can be accessed at ftp://18.104.22.168/DES/ARD. A user name and password are NOT required to download files.
The following surface and profile data sets are available for download:
- Berlin/Gray meteorological data set
- Concord/Gray meteorological data set
- Jaffrey/Gray meteorological data set
- Lebanon/Gray meteorological data set
- Manchester/Gray meteorological data set
- Portsmouth/Gray meteorological data set
- Rochester/Gray meteorological data set
- Whitefield/Gray meteorological data set
The NH Meteorological Zone Map 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.
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