NCERT Important Questions Class 9 Science biology Chapter 14
Important NCERT Extra Questions
Chapter 14 Natural Resources
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Define air pollution.
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Air pollution is degradation of the quality of air due to addition of natural or human made particulate matter, gases and vapours that have an adverse effect on humans, animals and vegetation.