To determine air quality measurement Measuring the area north and South of the wind direction. At the end of the pipe, for example, must be kept 3-6 meters high from the ground in case of Gas and 1.5-6 m for dust (EPA Method). The position to place the machine store, for example, the high trees or buildings should be located away from the RADIUS open not less than 20 metres and has a radius of from approximately 120 degrees on top.
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