Info

FIGURE 2.14 Estimated adjusted mortality rate ratios, taking the least polluted city, Portage, Wisconsin (P), as 1.0. T = Topeka, Kansas; W = Watertown, Massachusetts; L = St. Louis, Missouri; H = Harriman, Tennessee; S = Steubenville, Ohio. (Adapted from Dockery et al., 1993.)

FIGURE 2.14 Estimated adjusted mortality rate ratios, taking the least polluted city, Portage, Wisconsin (P), as 1.0. T = Topeka, Kansas; W = Watertown, Massachusetts; L = St. Louis, Missouri; H = Harriman, Tennessee; S = Steubenville, Ohio. (Adapted from Dockery et al., 1993.)

fires. As with anthropogenic particulate emissions, particle size is important. Operationally speaking, terrestrial dust is generally in the size range ~ > 10 ┬┐im in diameter and is primarily composed of crustal elements, including silicon, aluminum, iron, sodium, potassium, calcium, and magnesium. Because particles from mechanical erosion processes tend to be quite large, they have been of less concern from the point of view of health effects since they tend to be removed in the upper respiratory system.

Particles are generated at the surface of the ocean by the bursting of bubbles and some of these are

Naso-oro-pharyngo-laryngeal region

Naso-oro-pharyngo-laryngeal region o 0.4 -

Was this article helpful?

0 0

Post a comment