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Air pollutants are substances that, when present in the atmosphere in sufficient quantities, may adversely affect people, animals, vegetation or inanimate materials.

Air Profile Recorder (APR), a narrow-beam recording radar altimeter designed to provide topographic profiles for use in the mapping of wilderness areas. The instrument employs a 3.2 cm pulse transmitter that feeds a parabolic radiator, mounted below the aircraft.

Air Traffic Control (ATC) is the service provided to pilots to assist them in operating their aircraft in a safe, orderly and efficient manner.

As would be expected in a large, thinly populated country, air transport is a very important part of the Canadian economy.

For statistical and administrative purposes, the federal government has divided the Canadian airport system into 5 major classes of airports: international, national, regional, local commercial and local.

A new wave of construction was inspired by the formation of the Department of Transport in 1937 and the inauguration of Trans-Canada Airlines (now Air Canada) in 1937. Dorval Airport (1940-41) near Montréal represented the new breed of airports.

Alabama, Confederate warship constructed in Britain during the American Civil War. The US sought to have the ship detained in Britain, but it escaped. Until it was sunk in June 1864, it attacked Union (Northern) shipping, inflicting great losses.

The Alaska boundary dispute took place between Canada and the United States over the boundary of southeastern Alaska and the coast of British Columbia.

​Alberta joined Confederation along with Saskatchewan in 1905, when the two new provinces were created out of a section of the Northwest Territories.

The Alberta Ballet Company was founded in Edmonton in 1958 by Ruth Carse as an amateur troupe under the name of Dance Interlude. It was incorporated in 1961 as the Edmonton Ballet Company and reconstituted in 1966 as a professional dance ensemble under its present name. Carse retired in 1975.

Alberta Choral Federation (Alberta Choral Directors' Association 1972-81). Incorporated in 1972, the organization assumed its current name and extended the scope of its activities and services to choral singers and choirs, as well as directors, in 1981.

Alberta College Conservatory of Music (Alberta College Music Centre 1969-85). The music department of Alberta College, founded in 1903 in Edmonton by the Methodist Church under the principalship of the Rev J.H. Riddell.

Alberta Composers' Association/Association des Compositeurs de l'Alberta (ACA). Founded at Edmonton in September 1977 upon the advice of an ad hoc committee comprising the composers Violet Archer, Dean G. Blair, David Duke, Ronald Hannah, and Richard Johnston, with the assistance of John Weinzweig.

Alberta Culture and Multiculturalism (Alberta Culture until 1987). Department established in 1975 by the government of the province of Alberta.

The Alberta Energy Company Ltd (AEC) is one of Canada's largest private-sector independent oil and gas exploration and production companies. Common shares trade on the Toronto, Montreal and New York stock exchanges.

The Alberta Heritage Savings Trust Fund was established in 1976 by an Act of Legislature with initial resources of $1.5 billion in cash and assets from the General Revenue Fund. Its purpose is to save and invest revenues from Alberta's oil and gas.

The site is important because it confirms that Centrosaurus was a herding dinosaur, and documents that the herds were larger than previously thought, numbering well into the thousands.

Alberta Music Educators' Association (AMEA). Founded in Edmonton in April 1957 at the instigation of Leslie Bell and Alan Rumbelow, the latter at that time supervisor of music for Edmonton public schools.

Alberta Music Festival Association. Umbrella organization formed ca 1964 to represent and co-ordinate the competition festivals of the province of Alberta.

AOSTRA was merged into the Provincial Ministry of Energy's Oil Sands and Research Division in 1994. The corporation was dissolved in 2000 and its assets and liabilities were vested in the Alberta Science and Research Authority.