Ozone depletion primarily affects which layer of the atmosphere?

The stratosphere.

Ozone in the troposphere is considered ___ because it contributes to air pollution.

Bad

True or False: A single chlorine atom can destroy thousands of ozone molecules.

True

What are the polar stratospheric clouds (PSCs) and their role in ozone depletion?

PSCs provide surfaces for chemical reactions that release chlorine from its reservoirs, accelerating ozone depletion.

Fill in the blank: The significant ozone hole over Antarctica is primarily due to ___ temperatures and the presence of ___ clouds.

Cold; polar stratospheric

What are chlorofluorocarbons (CFCs) and why are they harmful to the ozone layer?

CFCs are chemicals made of chlorine, fluorine, and carbon that release chlorine atoms when exposed to UV radiation, which then destroy ozone.

Riddle: I am found in fire extinguishers and pesticides, my potential to destroy ozone is hundreds of times greater than chlorine. What am I?

Bromine

Which regulatory measures were introduced in 2000 to control ozone-depleting substances?

The Ozone Depleting Substances (Regulation and Control) Rules, which set deadlines for phasing out various ODSs.

True or False: The Arctic experiences a larger and more permanent ozone hole compared to Antarctica.

False; Antarctica has a larger and more persistent ozone hole.

What is the significance of the Dobson unit in measuring ozone levels?

The Dobson unit measures the thickness of the ozone layer, indicating the total amount of ozone in a column of air.