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The meaning of AIR is the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth; also : the equivalent mix of gases on another celestial object (such as a …

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 …

Feb 10, 2026 · Air, mixture of gases comprising the Earth’s atmosphere. The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are variable in both …

Oct 1, 2024 · Air is the invisible mixture of gases that surrounds Earth. Air contains important substances, such as oxygen and nitrogen, that most species need to survive.

AIR meaning: 1. the mixture of gases that surrounds the earth and that we breathe: 2. the space above the…. Learn more.

AIR definition: a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere. See examples of air used in a sentence.

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Our recently redesigned site highlights air quality in your local area first, while still providing air quality information at state, national, and world views.

The air quality forecast is a prediction of the day’s overall AQI issued by state and local air quality forecasters. Each polygon on this map represents a reporting area that issues a forecast.