What is the main purpose of an air dispersion model used in landfill air quality monitoring?

The main purpose of an air dispersion model used in landfill air quality monitoring is to predict the concentration of air pollutants at various distances and directions from the landfill source, allowing for assessment of potential impacts on surrounding communities and compliance with air quality regulations. An air dispersion model is a computer program that uses mathematical equations to simulate how air pollutants are transported and diluted in the atmosphere. The model takes into account factors such as emission rates from the landfill, meteorological conditions (wind speed, wind direction, temperature, atmospheric stability), topography, and the height and location of emission sources. By simulating the dispersion process, the model can estimate the ground-level concentrations of pollutants such as methane, volatile organic compounds (VOCs), and particulate matter at different receptor locations (e.g., nearby residences, schools, businesses). This information is used to determine if the landfill's emissions are causing or contributing to air quality violations, to evaluate the effectiveness of emission control measures, and to inform decisions about landfill design and operation. It also enables the prediction of the extent to which air pollutants will impact nearby areas. The results can be used to demonstrate compliance with regulatory limits, assess potential health risks, and implement mitigation measures if necessary.