Factories should not be located in densely populated areas.Why?
Your friend has answered correctly but I would like to add few more points in the answer-
Factories contribute a lot in all types of pollution i.e water, air, soil and noise pollution. They generate large amount of harmful wastes which can badly affect the health of individual, if not properly disposed off. Sometimes factories discharge their toxic chemicals in the nearby water bodies which affect the health of people as they use this water for different domestic purposes. So to avoid all these problems, factories should be planted far away from the residential areas.
@Nitin:- Good answer, keep contributing!!
Noise pollution can diminish an individual's quality of life by interfering with these ...examining the impact of the health care industry not only on the population's health, but... effects or can be found in small amounts on everyday items in people's lives. ...traffic, airports, industries, factories and highly populated urban areas.