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air forces

(Encyclopedia) air forces, those portions of a nation's military organization employing heavier-than-air aircraft for reconnaissance, support of ground troops, aerial combat, and bombing of enemy…

plein-air

(Encyclopedia) plein-airplein-airplān-ârˈ, Fr. plĕn-ĕrˈ [key] [Fr.,=open-air], term used for paintings or drawings made directly from nature and infused with a feeling of the open air. Painting…

Florence Earle Coates: The Unconquered Air

The Unconquered AirFlorence Earle CoatesIOthers endure Man's rule: he therefore deems I shall endure it — I, the unconquered Air! Imagines this triumphant strength may bear His paltry sway…

U.S. Cities with Cleanest Air, 2011

Each year the American Lung Association issues their "State of the Air" report. They track ozone pollution, short-term particle, and year-round particle…

The Toxic 100: Top Corporate Air Polluters

This index identifies the top air polluters among corporations. The data come from the 2021 report from the Political Economy Research Institute. Rank Corporation 1. LyondellBasell 2. Boeing 3.…

temperature inversion

(Encyclopedia) temperature inversion, condition in which the temperature of the atmosphere increases with altitude in contrast to the normal decrease with altitude. When temperature inversion occurs…

ventilation

(Encyclopedia) ventilation, process of supplying fresh air to an enclosed space and removing from it air contaminated by odors, gases, or smoke. Proper ventilation requires also that there be a…

Arnold, Henry Harley

(Encyclopedia) Arnold, Henry Harley, 1886–1950, American general, chief of the U.S. Army Air Forces (1942–46), known as “Hap” Arnold, B. Gladwyne, Pa., grad. West Point, 1907. Assigned (1911) to the…