What are ODS?

What are ODS?

• A. Chemicals that destroy the ozone layer
• B. Chemicals that purify air
• C. Substances that enhance ozone
• D. Substances used in drinking water treatment

Answer: (A)

ODS are ozone-depleting substances—human-made chemicals that damage the ozone layer in the stratosphere. When these compounds reach the upper atmosphere, ultraviolet light can break them apart and release chlorine or bromine atoms. Those atoms kick off catalytic reactions that destroy ozone molecules, thinning the ozone layer that shields life from harmful UV radiation. The health and environmental stakes are real: more UV can increase skin cancer risk, cataracts, and affect ecosystems. You’ll often hear about familiar examples like chlorofluorocarbons in old refrigerants and foam blowing agents, halons used for fire suppression, and some solvents such as carbon tetrachloride and methyl chloroform. Because of their impact, many ODS have been phased out or tightly regulated worldwide under international agreements. They’re not substances whose job is to purify air, nor anything that would enhance ozone, and they aren’t typical chemicals used in drinking water treatment.

ODS are ozone-depleting substances—human-made chemicals that damage the ozone layer in the stratosphere. When these compounds reach the upper atmosphere, ultraviolet light can break them apart and release chlorine or bromine atoms. Those atoms kick off catalytic reactions that destroy ozone molecules, thinning the ozone layer that shields life from harmful UV radiation. The health and environmental stakes are real: more UV can increase skin cancer risk, cataracts, and affect ecosystems. You’ll often hear about familiar examples like chlorofluorocarbons in old refrigerants and foam blowing agents, halons used for fire suppression, and some solvents such as carbon tetrachloride and methyl chloroform. Because of their impact, many ODS have been phased out or tightly regulated worldwide under international agreements. They’re not substances whose job is to purify air, nor anything that would enhance ozone, and they aren’t typical chemicals used in drinking water treatment.