36

Rl02 + 03 ® R02 + 202

Source: K.L. Demerjian and K.L. Schere, 1979, Proceedings, Ozone/Oxidants: Interactions with Total Environment II (Pittsburgh: Air Pollution Association).

Note: M stands for any available atom or molecule which by collision with the reaction product carries off the excess energy of the reaction and prevents the reaction product from flying apart as soon as it is formed.

Source: K.L. Demerjian and K.L. Schere, 1979, Proceedings, Ozone/Oxidants: Interactions with Total Environment II (Pittsburgh: Air Pollution Association).

Note: M stands for any available atom or molecule which by collision with the reaction product carries off the excess energy of the reaction and prevents the reaction product from flying apart as soon as it is formed.

The removal of particles (aerosols and dust) from the atmosphere involves dry deposition by sedimentation, washout by rainfalls and snowfalls, and dry deposition by impact on vegetation and rough surfaces.

A volcanic eruption is a point source which has local effects (settling of particles and fumes) and global effects since the emissions can circulate in the upper atmosphere (i.e., the stratosphere) and increase the atmospheric aerosol content.

From the point of view of atmospheric protection, some of these reactions are favorable as they quickly yield products that are less harmful to humans and the biosphere. However, the products of some reactions are even more toxic than the reactants, an example being peroxylacetyl nitrate.

The atmospheric chemical reactions of solid and gaseous substances in industrial emissions are complex. A deeper analysis and description is beyond the scope of this section.

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