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Topic: Science
Number of pages / Number of words: 7 / 1921
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The PSI considers the levels of carbon monoxide, ozone, nitrogen, sulfur dioxide, and particulate matter in the air and uses a scale (from 1-500) to show the combined levels of pollutants in the air on a given day. If the PSI level is less than 50, then the air is considered to be healthy. However, a PSI of 300 or more may be hazardous to your health...


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However, a PSI of 300 or more may be hazardous to your health. When the PSI is above 400, the EPA highly recommends that everyone in the general population should remain indoors. Also at PSI levels of above 400, "premature death of ill and elderly persons may result (Dreher 1998)." Even PSI levels of around 100 are considered to be unhealthful; the EPA suggests that "susceptible individuals, such as those with heart or lung disease, should minimize outdoor activity (Underwood 1998)...


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