Air Quality Metric. One of the measures typically used for air pollution. These are daily values

calculated directly from daily observations, or through various mathematical manipulations of

hourly observations. Typical ozone metrics include the highest hourly observations during the

course of each day, such as the average of all twenty four hourly observations. These daily

values may be summarized to characterize seasonal and annual values.

Air Quality Model. Air quality models are valuable air quality management tools. Models are

mathematical descriptions of pollution transport, dispersion, and related physical and chemical

processes in the atmosphere. Air quality models estimate the air pollutant concentration at many

locations, which are referred to as receptors, or over a spatial area that has been divided into

uniform grid squares. The number of receptors or grid-cells in a model far exceeds the number of

monitors one could typically afford to deploy in a monitoring study. Therefore, models provide a

cost-effective way to analyze pollutant impacts over a wide spatial area where factors such as

meteorology, topography, and emissions from both local and remote sources could be important.

Some examples include CMAQ and CAMx.



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