R and V Works FF6 Informations techniques télécharger pdf (Page 72)

Compressor Application Manual

VII

Approximately 90% of the Earth's ozone is located

in a natural layer immediately above the Earth's

surface, known as the stratosphere.

Figure 45 – Schematic of the atmospheric layers that envelope the earth.

This natural layer formed by the ozone acts as a

protective shield against the ultraviolet rays.

The primary concern about the probable

destruction of the ozone layer by the CFCs was

raised when the theory was published that chlorine

atoms released by the CFCs could migrate as far

as the stratosphere and destroy the ozone

molecules (Molina & Rowland, 1974).

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R and V Works FF6 Informations techniques Page 72