Environmental Engineer Greatview is conducting air monitoring at Grand Canyon to assess the impact of PM on visibility reduction there. From where he stands at the south rim of the canyon, he can barely see the other side of the canyon, which is 18.0 miles away. If the mean particle size is 0.3 μm, the extinction efficiency Qe is 1.5, and particle density is 1.10 g/cm³, what is the corresponding aerosol mass concentration (in μg/m³)?

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