# SG Air — Singapore Air Quality Index

> Singapore air quality index and pollution monitoring app. (iPhone/iPad app by Sim Ruenn Kang.)

- Source: https://appshunter.io/ios/app/sg-air/id881004442 (this page in markdown: same URL + `.md`)
- Developer: [Sim Ruenn Kang](https://appshunter.io/developer/434116446)
- Category: Weather, Travel
- Price: Free with in-app purchases
- Rating: 3.00/5 from 2 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 22 MB
- Languages: American English
- Released: 2014-06-08
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/sg-air/id881004442/reviews.md

## What is SG Air?

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:
- 1hr PSI/AQI Widget
- NOTIFICATION service hourly on hazy day base on 1hr PM2.5 PSI/AQI > 100, 24hr PSI/AQI>100 or Sumatra Hotspot count>100
- supported PSI and AQI
- Haze map with wind direction, hotspots location and haze coverage (Map update on evening everyday)
- Line charts with 24hrs data including 24hr PSI/AQI, Sumatra Hotspot Count, 1hr PM2.5, 24Hr PM2.5, 24Hr PM10, 24Hr SO2, 1Hr NO2, 8Hr O3 and 8Hr CO.
- Crowdsource air quality report - check out nearby air quality reported by app users.
- Crowdsource photo - photo uploaded by app users.
- SG Air Camera

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.

## Key features

- 1-hr PSI/AQI Widget
- Hourly haze notifications
- Haze map with wind and hotspots
- 24-hour data line charts
- Crowdsourced air quality reports
- SG Air Camera access

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Banner | $3.99 | one-time |


## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/sg-air/id881004442/reviews.md

### 4/5 — Broken Map

*2019-03-22*

The hotspot map has not worked for several weeks now. Updates soon?

### 1/5 — deleted immediately

*2016-04-13*

please hire a proper UX designer. your user interface is visual acne. I cringed the moment I opened it. deleted immediately.

### 5/5 — Good Snap Shot

*2015-09-17*

This app captures the SG haze conditions in 1 screen shot and saves me the trouble to look at multiple NEA website. Also, it presents the info in a pictorial format - a pictures saves a 1,000 words.  Good job!

### 5/5 — Good app

*2015-05-07*

Im moving to Singapore soon. After having spent the last 10 years living in China, I've gotten used to checking on the air quality every day. This would be one I'll be using when I'm there.

### 5/5 — Well designed app

*2014-07-05*

All the info - region,different measures - at one glance.  Even conditions in Indonesia

## Frequently asked questions about SG Air

### What air quality metrics does SG Air provide?

SG Air provides 1-hour and 24-hour PSI/AQI, 1-hour and 24-hour PM2.5, 24-hour PM10, sulphur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO).

### Does SG Air offer notifications for poor air quality?

Yes, SG Air provides hourly notifications on hazy days if the 1-hour PM2.5 PSI/AQI exceeds 100, the 24-hour PSI/AQI exceeds 100, or the Sumatra Hotspot count is over 100.

### How often does the haze map update?

The haze map, which includes wind direction, hotspot locations, and haze coverage, updates every evening.

### Can I report or view air quality from other users?

Yes, SG Air features crowdsourced air quality reports and photos uploaded by other app users, allowing you to check nearby air quality.

### What is the rating and age appropriateness of SG Air?

SG Air has a rating of 3.0 stars from 2 ratings and is suitable for users aged 4 and above.

### Does SG Air have advertisements?

Yes, SG Air contains advertisements.

### What devices is SG Air compatible with?

SG Air is compatible with Apple Watch, iPhone, iPad, and iPod.

### When was SG Air last updated?

SG Air was last updated on November 10, 2023, with version 2.08.

## Version history (last 5 releases)

### 2.08 — 2023-11-10

- minor bug fixing

### 2.07 — 2023-11-09

- minor bug fixes

### 2.06 — 2023-10-28

- minor bug fixes

### 2.05 — 2023-10-24

- bug fixes

### 2.04 — 2023-10-22

- Apple watch app changed 3hr PSI to 1hr PSI.
- update coding to support iOS 17
- fix missing hotspots icon in the haze map.
- fix haze map image not load on main page.

## Apps similar to SG Air

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [myENV](https://appshunter.io/ios/app/myenv/id444435182) | 4.1 (300) | Free | Weather |
| [Haze@SG](https://appshunter.io/ios/app/hazesg/id663816616) | 5.0 (2) | Free | Weather |
| [Air Quality(AQI)](https://appshunter.io/ios/app/air-qualityaqi/id6468081103) | — | Free | Weather |
| [Digital Barometer-Air pressure](https://appshunter.io/ios/app/digital-barometer-air-pressure/id6744086943) | 4.5 (13) | Free | Weather |
| [SinEnvironment](https://appshunter.io/ios/app/sinenvironment/id6505028362) | — | Free | Weather |
| [Nebulo](https://appshunter.io/ios/app/nebulo/id896360158) | 4.0 (1) | Free | Weather |

## More apps by Sim Ruenn Kang

- [SG Weather](https://appshunter.io/ios/app/sg-weather/id434116443)
- [台灣的天氣](https://appshunter.io/ios/app/id568637369)
- [My Weather](https://appshunter.io/ios/app/my-weather/id650294020)
- [HK Weather Nowcast](https://appshunter.io/ios/app/hk-weather-nowcast/id794345606)
- [SG GO](https://appshunter.io/ios/app/sg-go/id877286644)

All apps by Sim Ruenn Kang: https://appshunter.io/developer/434116446

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*