The layer of ___ found in the upper atmosphere provides a major protective barrier against harmful radiation from the Sun.

Every year, ___ of tons of man-made chemicals are released into the atmosphere.

___ can be produced from tobacco smoking and faulty heating appliances.

Carcinogens are chemicals that can potentially cause ___.

Most acid rain has a pH between ___.

Spruce and fir trees are failing to reproduce and are dying in the Shenandoah and Great Smoky Mountains due to ___.

The ___ Amendments of 1990 established an Acid Rain Program to reduce emissions of sulfur dioxide and nitrogen dioxide at the least cost to society.

___ are flue-gas desulphurization equipment used to reduce sulfur dioxide emissions at fossil fuel burning plants.

___ is a colorless gas made up of 3 atoms of oxygen.

British scientists discovered a "hole" in the ozone layer in 1985 over ___.

Which chemical(s) break down and destroy ozone?

___ was established in 1987 requiring countries to cut CFC use in half by 1999.

___ is a colorless, odorless naturally occurring radioactive isotope.

___ can leak into homes through cracks in the foundation.

___ is a potent cancer-causing substance that can be found in gasoline.

___ is found in trace amounts in coal and is released when coal is burned.

In 1984, Bhopal, India the most publicized accidental release of dangerous chemicals occurred. It killed 3000 people and harmed 200,000 more.

The original Clean Air Act was passed in 1963 but out national air pollution control program is actually based on the ___ version.

Enforcement techniques including citations for violators of the law were not covered under the Clean Air Act.

Temperature inversions do not concentrate air pollution.

Conditions that favor the development of a strong surface inversion are ___.

Temperature inversions are most common in ___.

___ is often caused by heavy traffic, high temperatures, sunshine, and calm winds.