In the United States, the National Ambient Air Quality Standard (NAAQS) for Lead is 0.15 µ/m3 as a rolling three-month average. This differs from other NAAQS in that it uses a rolling period, so a new three-month period is calculated with each successive month (e.g., January-March, February-April, etc.).
One feature of Lakes Software applications that our users have come to appreciate, is the wealth of customization options available to provide high quality visualization of model output. Beyond the usual drawing tools for adding model objects, each application contains a set of Annotation Tools which allow users to add additional objects to the main display.
As we described in a previous Modeling Tip, the Ontario Ministry of the Environment, Conservation and Parks (MECP) now distributes Canadian Digital Elevation Model (CDEM) data in GeoTIFF format via a portal on their website.
AERSURFACE is a tool developed by the U.S. Environmental Protection Agency (USEPA) which uses digital land cover data to objectively calculate numeric values of surface characteristics (i.e. albedo, Bowen ratio, and surface roughness) required by AERMET, the meteorological preprocessor for the AERMOD air dispersion model.
Most users are aware of Lakes Environmental Software’s Import from Excel utility which reads hourly meteorological data from an Excel spreadsheet and generates a text-based data file in SAMSON format. The generated file can be used in a variety of air modeling applications.
A major step in any CALPUFF modeling study is to calculate geophysical properties of the modeling domain. The CALPUFF modeling system contains several preprocessors to perform these calculations.