![]() The most common form of silica is quartz. The atmospheric eddies cause a breaking apart of atmospheric parcels which mixes polluted air with relatively unpolluted air, causing polluted air at lower and lower concentrations to occupy successively larger volumes of air. The most important mixing process in the atmosphere which causes the dispersion of silica dust is eddy diffusion. The atmosphere does not flow smoothly but has seemingly random, rapidly varying erratic motions. Turbulence is highly irregular motion of the wind.The stronger the wind, the lower the plume. For buoyant sources, plume rise is affected by wind speed. Wind speed also affects the travel time from source to receptor halving the wind speed will double the travel time. Whether the source is at the surface or elevated this dilution takes place in the direction of plume transport. One of the effects of wind speed is to dilute continuously released silica dust at the point of emission. Warm air advection will cause veering with height. Cold air advection in air layer will cause the wind to back with height through the layer. Although surface friction causes the wind to shift clockwise (veer) with height near the ground, the horizontal thermal structure of the atmosphere may exert a dominating influence at higher altitudes, such that the wind will shift counterclockwise (back) with additional height. There is normally considerable change of direction with height, especially near the ground. Silica dust concentrations are sensitive to wind direction. Wind direction at the source of silica dust determines initial direction of transport processes such as convection and advection, which mediate silica dust buoyancy in the air.Fraction of a contaminant in the particle or vapor phase.Total mass concentration of a contaminant.Some important aerosol characteristics which can change are: They experience change with the passage of time. An aerosol consists of particles and the gas in which they are suspended. Silica dust behaves as an aerosol when suspended in the air. This is because the particle size governs the length of time for which the particle will remain suspended in the air, the way it will settle, and the air velocity required to remove the particles from the workings. Size distribution is key to the discussion of how long silica dust stays in the air.What factors affect silica dust staying in the air? What role is GRT playing in silica dust control?.What can we learn from silica real-time dust monitoring?.What are the global workplace exposure limits (WELs) for silica dust?.What factors affect silica dust staying in the air?.GRT explores how long silica dust stays in the air by answering the following: After all, we are in the 4th industrial revolution where data is the currency used to make informed decisions. The data-driven approach to silica dust control is seldom used in the industry and GRT is breaking that norm by showcasing the possibilities. It is a classic case of ‘Where air monitoring meets dust control’ because the particle size ranges measured by real-time air monitoring can provide tangible data to enhance the efficiency of dust control methods that are specific to what the data is saying. ![]() Understanding and dealing with silica dust behaviours in the air takes synergy between real-time air monitoring and silica dust control techniques. Respirable crystalline silica dust is carcinogenic, hence knowing how long it stays in air will provide more clarity on effective dust control methods which deal with it before and after it becomes airborne. It is amongst many types of airborne contaminants that may mix with and be diluted by ambient air and travel to a target person, object or area where it has the potential to cause health problems such as silicosis, chronic pulmonary obstructive disease (COPD) and lung cancer. Silica dust is an atmospheric contaminant that is emitted from different sources. It is not based on one factor, but multiple of factors which differ from one scenario to the other. ![]() How long silica dust stays in the air is a combination of factors such as particle size distribution, wind direction, wind speed and turbulence. ![]()
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