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National Ambient Air Quality Standards

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The Clean Air Act contains, NAAQS that stands for the National Ambient Air Quality Standards, under which there are certain pollutants that are classified as criteria pollutants. Criteria pollutants are as follows: particulate matter, ozone, carbon monoxide, nitrogen oxides, sulfur dioxides, and lead (1). These pollutants are under this classification because of their ability to harm the health of a population along with the environment, and also can cause property damage (1). Under the NAAQS there are primary and secondary standards, in which states and governments have to abide by to in compliance with the Act. Primary Standards are defined to “provide public health protection, including protecting the health of sensitive populations …show more content…
The AQI informs the public how clean or polluted the air is as well as the adverse health effects that may be associated with the inhalation of the air (3). The AQI thus, measures those criteria pollutants under the NAAQS which are defined as public health threat to the population. The AQI has categorized ozone and particulate matter as the “greatest threat to human health in country” (3). These pollutants are measured and given a number value which then tells the population how healthy the air they are breathing is. This ranges from 0 to 500, where the lower end of the spectrum is seen as the best air quality and as you move higher the more hazardous the air …show more content…
The current primary standard for sulfur dioxide under the EPA is a level of 75 ppb in the ambient air, with an averaging time of 1-hour (2). The averaging time was determined through the form “99th percentile of 1-hour daily maximum concentrations, averaged over 3 years” (2). The level of sulfur dioxide is measured through fluorescence spectroscopy principles that measure the fluorescence emitted by sulfur dioxide (4). Health effects regarding the impact of Sulfur Dioxide are of great concern with respect to respiratory effects. There has been adverse health effects ranging from bronchoconstriction and increased symptomatic asthma, these effects are most significant in at-risk populations (2). Long term exposure to sulfur dioxides can lead to extensive respiratory illness and the aggravation of existing heart disease. The EPA first set a standard for sulfur dioxide in 1971, with the latest update to sulfur dioxide being in 2010 (2). This was done to provide under the NAAQS better primary and secondary standards for better public health

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