SG Air APK

SG Air

Overview

• SG Air is a comprehensive Singapore air quality monitoring and reporting application.

• It provides real-time and historical environmental data, enabling users to stay informed about current pollutant levels and haze conditions.

• The app compiles official readings and user-contributed reports to deliver a full picture of air quality across Singapore and surrounding regions.

Air Quality Data Provided

SG Air supplies detailed readings for a variety of pollutants and indexes:

• 24-hour PSI (Pollutant Standards Index) / AQI (Air Quality Index) – Overall air quality based on multiple pollutants.

• 1-hour PM2.5 – Fine particulate matter measured in micrograms per cubic meter for short-term conditions.

• 24-hour PM2.5 – Average fine particulate matter over a day.

• 24-hour PM10 – Coarse particulate matter levels.

• Sulphur dioxide (SO2) – Monitored for potential respiratory effects.

• Nitrogen dioxide (NO2) – Reflects traffic and industrial emissions.

• Ozone (O3) – Monitored over an 8-hour period.

• Carbon monoxide (CO) – Also measured over an 8-hour period.

Key Features

• 1-hour PSI/AQI Widget for quick reference.

• Notification Service that alerts users hourly on hazy days when either 1-hour PM2.5 PSI/AQI exceeds 100, 24-hour PSI/AQI exceeds 100, or Sumatra hotspot count exceeds 100.

• Support for both PSI and AQI standards.

• Haze Map that displays wind direction, hotspot locations, and haze coverage, updated daily in the evening.

• Line Charts showing 24-hour data for PSI/AQI, Sumatra hotspot count, and pollutant levels for PM2.5, PM10, SO2, NO2, O3, and CO.

• Crowdsourced Air Quality Reports to view nearby readings contributed by app users.

• Crowdsourced Photos showing haze conditions from different areas.

• SG Air Camera feature for capturing and sharing local haze conditions.

Technical Notes

• 1-hour PM2.5 PSI breakpoints are derived using formulas from Singapore’s National Environment Agency (NEA) and based on 24-hour PM2.5 breakpoints in micrograms per cubic meter.

• AQI breakpoints follow standards set by the United States Environmental Protection Agency (EPA).

FAQ

Q: Where does SG Air get its air quality data from?

A: The app compiles readings from official government sources like Singapore’s National Environment Agency (NEA) and also integrates data contributed by users. These include live pollutant measurements, haze observations, and photos, offering a more complete, on-the-ground picture.

Q: Which pollutants can I track with SG Air?

A: SG Air offers detailed readings for multiple pollutants. You can monitor fine particulate matter (PM2.5) both hourly and over 24 hours, coarse particles (PM10) over 24 hours, sulphur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3) over an 8-hour period, and carbon monoxide (CO) over an 8-hour period. It also calculates overall air quality using the PSI and AQI indexes.

Q: What is the difference between PSI and AQI in SG Air?

A: PSI (Pollutant Standards Index) is based on Singapore’s official method for measuring overall air quality from multiple pollutants over different time periods. AQI (Air Quality Index) follows the United States Environmental Protection Agency’s standards. SG Air supports both systems so you can choose the one you prefer or compare them.

Version History

v2.16——26 Nov 2025

Singapore Air quality report in PSI/AQI with hourly notification. Download the latest version of SG Air to enjoy new features and updates immediately!

*2.16

minor bug fixes

*2.14

-minor bug fixes

*2.12

- bug fixes