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3. US Standards. https://www.epa.gov/criteria-air-pollutants/naaqs-table#2. Accessed 18 Aug 2021.
4. WHO & EU Standards. https://www.eea.europa.eu/themes/air/air-quality-concentrations/air-quality-standards. Accessed 18 Aug 2021.
5. Indian Standards. http://cpcbenvis.nic.in/air_pollution_main.html#. Accessed 18 Aug 2021.