There are many things within our environment that can have negative effects on human health some positive and some negative. Examples of negative effects would include air quality, noise pollution, greenhouse effects and the ripple effect on the food supply. The air quality index is a measure of daily air quality, the Air Quality Index (AQI) tells you how clean or polluted your air is and what associated health concerns you should be aware of such as allergic reactions. Conversely, indoor pollution can be a problem as well. The level of carbon monoxide in cigarette smoke contained in enclosed places was found to be 4,000 times greater than that allowed in the clean air standard established by the EPA. Many nonsmokers are extremely sensitive to tobacco smoke. These individuals may have experienced symptoms such as itchy eyes, difficulty in breathing, painful headaches, nausea, and dizziness in response to just small amounts of smoke. Noise pollution is sound, this can have wide effects on the human body ranging from simple headaches with lower sound levels for short periods to sever ear trauma from higher levels over sustained periods. Some ongoing studies indicate that other far ranging health issue may be associated with sustained high noise levels. The natural greenhouse effect is responsible for making Earth habitable; it keeps the planet 33 degrees Celsius (60 degrees Fahrenheit) warmer than it would otherwise be. An increase in greenhouse gases resulting from human activities is creating the enhanced greenhouse effect, trapping more heat and causing dangerous global climate change. The residual effects on the food chain from air and water pollution can be devastating on the food chain, example of this are higher mercury levels in fish, and toxins identified in food produced in areas that have higher ground pollutants making them unsafe for human consumption.
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