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2. 2) Air Pollution Reduction Department of the Capital city, Session document for reducing air pollution (20 May 2016), Euro standard.
3. 3) Department of the Environment and Energy, International Fuel Quality Standards and Their Implications for Australian Standards, Final Report 2014, EU. Retrieved from http://www.environment.gov.au/system/files/resources/f83ff2dc-87a7-4cf9-ab24-6c25f2713f9e/files/international-feul-quality-standards.pdf
4. 4) National Agency of Meteorology and Environmental Monitoring, Air Quality, Standard. Retrieved from http://agaar.mn/article/legal/standard?page=2
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