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  2. Air pollution - Wikipedia

    en.wikipedia.org/wiki/Air_pollution

    Air pollution is the presence of substances in the atmosphere that are harmful to humans and other living beings, or cause damage to the environment. Air pollution can be chemical, physical or biological. [1]

  3. Montreal Convention - Wikipedia

    en.wikipedia.org/wiki/Montreal_Convention

    The Montreal Convention (formally, the Convention for the Unification of Certain Rules for International Carriage by Air) is a multilateral treaty adopted by a diplomatic meeting of ICAO member states in 1999.

  4. Visual pollution - Wikipedia

    en.wikipedia.org/wiki/Visual_pollution

    Visual pollution is the degradation of the visual environment due to unattractive or disruptive elements that negatively impact the aesthetic quality of an area. It can affect urban, suburban, and natural landscapes. [1]