Where is the ozone layer present?

Directions: Read the passage given below carefully and answer the question that follows.

The major problem related to environmental pollution and decrease in the amount of natural resources vary from local, regional and global levels. A lot of harm has been caused to the environment due to pollution at various levels. Air pollution results from burning of coal and other fossil fuels. They must be removed from air to keep our air clean. Sewage from homes and waste from industries are major causes of pollution of water bodies which kill fish and other animals living in the water bodies causing water pollution. Land pollution is another type of pollution in which solid waste products create problem when dumped in the landfills. Other major environmental issues relate to increasing greenhouse effect which is warming the earth and depletion of ozone in the atmosphere. The main reasons of greenhouse effect are increase in the level of carbon dioxide and other harmful gases besides cutting of trees in the forests. The depletion of ozone in the atmosphere poses various risks like skin cancer and other problems.