Question

When do we consider environment to be polluted?

• A. When the beauty of environment changes
• B. When the composition of environment changes
• C. When the level of unwanted materials in the environment crosses the permissible limit
• D. None of the above

Answer 1

The correct option is C When the level of unwanted materials in the environment crosses the permissible limit

Environment is said to be contaminated when there is introduction of some unwanted contaminant in the natural environment. There are certain limitations to the presence of these contaminant upto to which it is considered to be safe. Increase in the level of these would be considered to be polluted.