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diesel engine soot emissions from the exhaust pipe are 1500 g/m3 and they spread with the wind. The concentration is diluted with the wind according to the following function: m = m0e-kvx, where m0 = concentration at starting point, x = distance, v = wind speed, k = -45.9 s (dispersion factor). How far is the concentration below the PM2.5 limit value of 25 g/m3 when the wind speed is 5 m/s and the background concentration is in the range of 5 g/m3?