Singapore Air quality report with 1-hr PSI/AQI, 24hr PSI/AQI, 1hr PM2.5(fine particulate matter), 24Hr PM2.5, 24Hr particulate matter (PM10), sulphur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO). Features: - NOTIFICATION service hourly on hazy day base on PSI/AQI > 100, Sumatra Hotspot count>120 or sub-indexes>100 - supported PSI and AQI - index value with upward or downward ARROW to indicate the haze is getting better or getting worse. - line chart in background - Haze map with wind direction, hotspots location and haze coverage (Map update on evening everyday) - Sub-indexes summary board display, easier to see the overall status. - 10 bar charts with 24hrs data including 1hr PSI/AQI, 24hr PSI/AQI, Sumatra Hotspot Count, 1hr PM2.5, 24Hr PM2.5, 24Hr PM10, 24Hr SO2, 1Hr NO2, 8Hr O3 and 8Hr CO. Notes: - 1hr PM2.5 PSI: We convert it by following formula from NEA and breakpoints of 24-hr PM2.5(ug/m3). - AQI breakpoints referred from The United States Environmental Protection Agency (EPA) - if you encounter error on Apple Watch, please reinstall apple watch app at Watch > SG Air.