Problem 1
What is a Dobson Unit? How is it used in relation to atmospheric ozone levels?
Problem 2
If the overhead ozone concentration at a point above the Earth's surface is \(250 \mathrm{DU}\), what is the equivalent thickness in millimeters of pure ozone at \(1.0 \mathrm{~atm}\) pressure?
Problem 7
What are two effects to human health that scientists believe will result from ozone depletion?
Problem 8
Define what is meant by a tropospheric sink.
Problem 9
Explain what CFCs were and some of their uses. Did they have a tropospheric sink? Why did their emissions in air lead to an increase in stratospheric chlorine?
Problem 10
Explain what HCFCs are and state what sort of reaction provides a tropospheric sink for them. Is their destruction in the troposphere \(100 \%\) complete? Why are HCFCs not considered to be suitable long-term replacements for CFCs?
Problem 12
Chemically, what are halons? What was their main use?
Problem 13
What gases are being phased out according to the Montreal Protocol agreements?
