This form of smog tends to be sulfur-based (also known as grey-smog):

One of the negative effects of air pollution is that it can cause problems in the ozone layer. Which class of chemicals are known to deplete ozone?

Which of the following is least likely to be a dangerous consequence of leachate from a sanitary landfill?

Tim is the Director of U.S. Operations atop a multinational oil and petroleum company, Company X. The United States refining facility is producing a liquid byproduct and Tim has made the executive decision to dispose of the waste product in the river that runs alongside the facility. To abide by federal law, Company X will need to apply for a discharge permit through the National Pollutant Discharge Elimination System (NPDES). Which specific federal law imposes the permitting system for point-source discharge of pollutants into "navigable waters"?

During prolonged periods of __________, air pollutants build up and are trapped in a dense, cool layer of air beneath a layer of less dense, warm air.

All of the following may be natural sources of pollution except __________.

Which of the following is not a type of water pollution?

Water pollutants originate from both natural and human-made causes and they are classified into two general types.

Name the two types of sources of water pollution?

Many times eutrophication creates dead zones or hypoxic zones in bodies of water. The most famous dead zone in North America occurs where the Mississippi River outflows into the Gulf of Mexico. What important resource do dead zones not have?

Which infamous locale garnered public attention by bringing to light the dangerous effects of disposing of toxic chemicals underground?