Community health focuses on the study of and an improvement in the health of people living in geographically-based communities (in the same place).
Environmental pollution is the introduction of different harmful pollutants into the natural environment that makes the environment unhealthy to live in.
Environmental health refers to all the factors external to a person, such as physical, chemical and biological factors, and all factors impacting behaviours, that can potentially affect human health. It aims to prevent disease and create healthy environments.
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