The masses, which occur at a given (equivalent) diameter d can be measured and displayed.This is done in Figure 4.22 in a qualitative way with a logarithmic scale for thed-axis. Notice the two peaks, one at a diameter of somewhat less than 1 [μm] and oneat a diameter of around 10 [μm]. The smaller particles pose the highest health risk, asthey penetrate deepest into the lungs. When they are chemically or biologically active, forexample when they contain sulfuric acid, they may do much local damage ([21], p. 116).As the smallest particles are most dangerous, regulations define a quantity PM10. This isFigure 4.22 Mass distribution of polluting particles in the atmosphere. The horizontal scaleis logarithmic.
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