Earth's Ozone Part 2

As ozone depletes, humans will more likely suffer from skin cancer, eye damage and other health problems because of higher exposure to the sun's ultraviolet rays. Land and ocean-based plants also would be hurt.
The atom bomb dropped by the U.S. on Hiroshima, Japan, in World War II killed at least 70,000 people instantly and destroyed two-thirds of the city. Three days later, the U.S. dropped a second nuclear bomb on Nagasaki, Japan, killing about 40,000 people. Tens of thousands more died from radiation exposure in the months following the blasts.
Using chemistry-climate models and new estimates of smoke levels that would result from fires in cities following a nuclear blast, the researchers from the University of Colorado, University of California and the National Center for Atmospheric Research concluded ozone levels would drop 20 percent globally, 25 percent to 45 percent at mid-latitudes and 50 percent to 70 percent at northern high latitudes. The depletion would last five to eight years, the scientists said.
A hypothetical nuclear attack between India and Pakistan would distribute soot around the globe and atmospheric temperatures would increase 30 percent to 60 percent, leading to the depletion of ozone, the study said. Meanwhile, temperatures on land would drop.
Levels of ozone depletion during a nuclear winter calculated during the 1980s suggested the layer of atmosphere protecting the earth's surface from the sun's ultraviolet rays would fall by a maximum of 17 percent initially before improving to a loss of 8.5 percent during the three following years.