In 2015, zero percent of the days in the year was recorded to be in the unhealthy range. Air quality in 2013 and 2015 was affected by transboundary smoke haze from land and forest fires. Singapore also experienced a full-year of good and moderate air quality (in terms of PSI) in the years 2007, 2008, 2018 and 2020.
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Share of days in the year with unhealthy air quality (PSI) in Singapore from 2007 to 2022
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Share of days in the year with unhealthy air quality (PSI) in Singapore from 2007 to 2022
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Ministry of Sustainability and the Environment (Singapore). (September 21, 2023). Share of days in the year with unhealthy air quality (PSI) in Singapore from 2007 to 2022 [Graph]. In Statista. Retrieved June 17, 2025, from https://www.statista.com/statistics/1077412/singapore-unhealthy-air-quality-according-to-number-of-days-in-the-year/
Ministry of Sustainability and the Environment (Singapore). "Share of days in the year with unhealthy air quality (PSI) in Singapore from 2007 to 2022." Chart. September 21, 2023. Statista. Accessed June 17, 2025. https://www.statista.com/statistics/1077412/singapore-unhealthy-air-quality-according-to-number-of-days-in-the-year/
Ministry of Sustainability and the Environment (Singapore). (2023). Share of days in the year with unhealthy air quality (PSI) in Singapore from 2007 to 2022. Statista. Statista Inc.. Accessed: June 17, 2025. https://www.statista.com/statistics/1077412/singapore-unhealthy-air-quality-according-to-number-of-days-in-the-year/
Ministry of Sustainability and the Environment (Singapore). "Share of Days in The Year with Unhealthy Air Quality (Psi) in Singapore from 2007 to 2022." Statista, Statista Inc., 21 Sep 2023, https://www.statista.com/statistics/1077412/singapore-unhealthy-air-quality-according-to-number-of-days-in-the-year/
Ministry of Sustainability and the Environment (Singapore), Share of days in the year with unhealthy air quality (PSI) in Singapore from 2007 to 2022 Statista, https://www.statista.com/statistics/1077412/singapore-unhealthy-air-quality-according-to-number-of-days-in-the-year/ (last visited June 17, 2025)
Share of days in the year with unhealthy air quality (PSI) in Singapore from 2007 to 2022 [Graph], Ministry of Sustainability and the Environment (Singapore), September 21, 2023. [Online]. Available: https://www.statista.com/statistics/1077412/singapore-unhealthy-air-quality-according-to-number-of-days-in-the-year/
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