Averaging Periods

While several averaging periods are available for pollutants, the models are divided into two groups. The first group, referred to as short-term models, handles averaging periods from an hour to a year using hourly meteorological conditions. Note that most refined short term models calculate concentrations for block averaging periods rather than for running average periods within a day. Screening models fall into this category and predict concentrations for one averaging period only.

Long-term models use meteorological conditions ranging from a month or season to one or more years. The cli-matological data used in these models are generated from hourly data into joint frequency-distribution tables of wind speed, wind direction, and Pasquill-Gifford stability categories. These data are referred to as stability array (STAR) data sets.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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