# PM2.5台灣 vs Air Alarm G

The clearest difference is review sentiment: Air Alarm G at 100% against PM2.5台灣's 17%. PM2.5台灣's advantage is update cadence (every 2 weeks vs every 6 weeks) and iOS requirement (7.0 vs 17.2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PM2.5台灣 ships an update every 2 weeks, Air Alarm G every 6 weeks. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PM2.5台灣 | Air Alarm G |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 16.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 9 MB | 5 MB |
| Requires iOS | **7.0** | 17.2 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [YEH TSUNG MING](https://appshunter.io/developer/324655388) | [주식회사 공감센서](https://appshunter.io/developer/1756045824) |

## What reviewers say

### PM2.5台灣

[App page](https://appshunter.io/ios/app/pm25/id990281102)

Stay informed about PM2.5 air quality in Taiwan. Receive custom notifications for high pollution levels and track real-time rankings across different regions.

**Highlights:** Real-time PM2.5 concentration tracking, Customizable pollution level notifications, Nationwide and regional rankings, Alerts for exceeding pollution thresholds, Daily time-based reminders

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Air Alarm G

[App page](https://appshunter.io/ios/app/air-alarm-g/id6523420728)

Receive real-time, minute-by-minute alerts for ultrafine dust levels. This app provides instant notifications when air quality changes, utilizing precise sensor technology for accurate monitoring.

**Highlights:** Real-time ultrafine dust monitoring, Minute-by-minute air quality updates, Instant alerts for air quality changes, Powered by Gonggam Sensor technology, Precise air quality tracking

**In-app purchases:** none


## Frequently asked questions

### Is PM2.5台灣 free?

PM2.5台灣 is free to download, with no in-app purchases.

### Is Air Alarm G free?

Air Alarm G is free to download, with no in-app purchases.

### Do PM2.5台灣 or Air Alarm G have ads?

Neither PM2.5台灣 nor Air Alarm G shows ads.

### Which is updated more often, PM2.5台灣 or Air Alarm G?

PM2.5台灣 ships an update every 2 weeks, and Air Alarm G every 6 weeks. Most recently, PM2.5台灣 was updated on November 8, 2026 and Air Alarm G on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*