What are (airborne) ultra-fine particles?
Although we can’t see them, the air we breathe is full of microscopic particles. These particles are usually health hazardous and are thus considered as a specific type of air pollution. The size of these particles is in the order of several nanometers (one millionth of a millimeter) to several micrometers (one thousandth of a millimeter). In recent years, scientists have investigated the relation of particle size and health effects. They are finding convincing results indicating that ultra-fine particles (in the range around one hundred nanometer) play a special role and are potentially more health hazardous than the coarse particles.
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