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  1. May 3, 2024 · Learn about the mixture of gases that comprise the Earth's atmosphere, their proportions, and their effects on life and climate. Explore the history and applications of air locks, devices that permit passage between regions of differing air pressures.

    • The Editors of Encyclopaedia Britannica
  2. Oct 19, 2023 · Learn about the composition, properties, and effects of air, the invisible mixture of gases that surrounds Earth. Find out how air supports life, affects climate, and is used in various ways by humans and other organisms.

  3. noun. us / er / uk / eə r/ air noun (GAS) Add to word list. A2 [ U ] the mixture of gases that surrounds the earth and that we breathe: fresh air I went outside to get some fresh air. You should put some air in your tires - they look flat to me. the air B2 [ S ] the space above the ground, especially high above the ground:

    • What Is The Air Quality in Columbus Ohio?
    • Why Does Columbus Have Unhealthy Air Quality?
    • Does Columbus Have Cleaner Air Than Cincinnati?
    • Is Columbus Air Quality Improving?
    • What Does The Columbus Smog Alert Mean?

    Columbus air quality is generally clean. In 2019, Columbus air quality index (AQI) averaged an annual score of 37 or “good.” The US Environmental Protection Agency (EPA) describes “good” air quality as air that generally poses little to no health risk. Similar “good” ratings have been achieved each year in Columbus since 2012. While such optimistic...

    Columbus unhealthy air quality is largely attributable to two pollutants: fine particulate matter (PM2.5) and ozone. According to the Central Ohio Air Report, a majority of days in Central Ohio from November 2018 to October 2019 experienced “good’ US Air Quality Index (AQI) levels. In the summer, where ozone levels tend to be most severe, 22 percen...

    Despite Columbus’s larger population and higher traffic burden, air pollution levels here tend to be similar to those of Cincinnati. For ozone pollution, both Hamilton County (including Cincinnati) and Franklin County (including Columbus) were rated an “F” in 2019 for exceeding the federal allowance of unhealthy ozone days. Hamilton County, with Ci...

    Columbus pollution has improved steadily and significantly over the last several decades. Since 2000, the number of unhealthy ozone days has dropped from an average of 39.3 days to 4.3 days in 2018. Despite this improvement in “unhealthy” ozone days, the number of “good”-rated ozone days dropped from 81% to 78% in 2019 compared to the year prior. T...

    Columbus smog alerts are advisories indicating that air pollution has or will, at minimum, reach unhealthy levels for sensitive individuals. Franklin county, which includes Columbus, has up to 719,429 sensitive individuals that would be affected by a level one “orange” smog alert. The US Environmental Protection Agency (EPA) and numerous local agen...

  4. Learn the various meanings and uses of the word air as a noun and a verb, with synonyms, examples, and etymology. Find out how air can refer to the gas mixture, the atmosphere, the melody, the broadcast, and more.

  5. Air is a mixture of many gases and tiny dust particles. It is the clear gas in which living things live and breathe. It has an indefinite shape and volume. It has mass and weight, because it is matter. The weight of air creates atmospheric pressure. There is no air in outer space .

  6. noun. a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere. a stir in the atmosphere; a light breeze. overhead space; sky: The planes filled the air. circulation; publication; publicity: to give air to one's theories. the general character or complexion of anything; appearance:

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