3.jpgPopulation density refers to the number of individuals per square kilometer of land area. The population of an area effects the human health of an enviroment. Depending on if the land has a high population in a small area. It can effect human health in food problems, jobs, etc. If an area has low population it can also be in a negative way. Just for the simple fact that with the population being low the oppurtunities of that area would be low. The area should have a neutral balance of poplulation.