1. how do you know the air quality of a given location?
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The Short Answer: Air quality is measured with the Air Quality Index, or AQI. The AQI works like a thermometer that runs from 0 to 500 degrees. However, instead of showing changes in the temperature, the AQI is a way of showing changes in the amount of pollution in the air.
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The AQI is between 51 and 100. Air quality is acceptable; however, pollution in this range may pose a moderate health concern for a very small number of indi- viduals. People who are unusually sensitive to ozone or particle pollution may experience respiratory symptoms. Unhealthy for Sensitive Groups.
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According to the EPA, the annual mean air temperature of a city with one million people or more can be 1.8 to 5.4 degrees Fahrenheit warmer than surrounding areas. In the evening, the difference can be as much as 22 degrees, as rural areas quickly cool down after sunset, while cities maintain their heat.
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['light intensity.', 'carbon dioxide concentration.', 'temperature.']
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Air temperature is a measure of how hot or cold the air is. It is the most commonly measured weather parameter. More specifically, temperature describes the kinetic energy, or energy of motion, of the gases that make up air. As gas molecules move more quickly, air temperature increases.
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Ozone location. Most ozone (about 90%) is found in the stratosphere, which begins about 10–16 kilometers (6–10 miles) above Earth's surface and extends up to about 50 kilo- meters (31 miles) altitude. The stratospheric region with the highest ozone concentration is commonly known as the “ozone layer” (see Figure Q1-2).
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Why is the AQHI more useful to most of us? The Air Quality Health Index (AQHI) reflects current knowledge of the health effects associated with air pollution. The traditional Air Quality Index (AQI) is based on air quality standards and takes into consideration both environmental and human health concerns.
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['E = emissions;', 'A = activity rate;', 'EF = emission factor, and.', 'ER =overall emission reduction efficiency, %']
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The environment directly affects health status and plays a major role in quality of life, years of healthy life lived, and health disparities. Poor air quality is linked to premature death, cancer, and long-term damage to respiratory and cardiovascular systems.
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Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog. Some air pollutants are poisonous.
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['Olfaction.', 'Respiration.', 'Warming of Air.', 'Humidification of Air.', 'Filtering of Air.']
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['Wind.', 'Rain.', 'Humidity.', 'Latitude.', 'Temperature.', 'Elevation.', 'Soil composition.', 'Salinity (the concentration of salt in water)']
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AirBeam is HabitatMap's handheld tool that measures air pollution. While historically, air pollution monitors have tended to be heavy, pricey and stationary, these new handheld devices cost as little as a couple of hundred dollars.
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Urban Atmosphere. Urban atmospheres are characterized as complex mixtures of hydrocarbons and oxides of sulfur and nitrogen. From: Fundamentals of Air Pollution (Fifth Edition), 2014.
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Why Air Quality is important. ... It provides air quality standards and objectives for key air pollutants, which are designed to protect human health and the environment. Air pollution can cause both short term and long term effects on health and many people are concerned about pollution in the air that they breathe.
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['Ozone absorbs radiation strongly in the ultraviolet region of the atmospheric spectrum between 220-290 nm. ... ', 'Pure ozone is a blue gas, with a strong irritating smell. ... ', 'It is about 1.5 times heavier than air and has a vapor density of 24, corresponding to the formula O3.']
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Air Quality Index is an indicator of overall air quality, because it takes into account all of the criteria air pollutants measured within a geographic area. Although AQI includes all available pollutant measurements, you should be aware that many areas have monitoring stations for some, but not all, of the pollutants.