Date: (historical data starts from 1 Oct 2014) [refresh]
PSI categorization for PM2.5 are based on 24-hr average (which this chart is NOT), and is included for reference only. PSI breakpoints is based on NEA 24-hr PM2.5 breakpoints http://www.haze.gov.sg/docs/default-source/faq/computation-of-the-pollutant-standards-index-(psi).pdf
AQI categorization for PM2.5 are based on 24-hr average (which this chart is NOT), and is included for reference only.
*Due to the way NEA presents it's data, 12am of Day X is actually referring to 12am of Day X+1.
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