International Day of Clean Air for blue skies
International Day of Clean Air for blue skies is held on September 7. This event in the first decade of the month September is annual. 
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Adopted by a UN General Assembly Resolution in 2019 (A/74/381), the International Day of Clean Air for blue skies – whose observance is facilitated by the UN Environment Progamme (UNEP) – stresses the importance of and urgent need to raise public awareness at all levels and to promote and facilitate actions to improve air quality.
Source: unenvironment.org
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