# PM2.5台灣 vs Air Quality Tracker

The clearest difference is in-app purchases: PM2.5台灣 at none against Air Quality Tracker's 4. PM2.5台灣 also leads on iOS requirement (7.0 vs 17.0). Air Quality Tracker's advantage is update cadence (every 3 days vs every 2 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Air Quality Tracker sells 4 in-app purchases, starting at $3.99 per 7 days. PM2.5台灣 asks for nothing beyond the download.

PM2.5台灣 ships an update every 2 weeks, Air Quality Tracker every 3 days. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | PM2.5台灣 | Air Quality Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free | — |
| Size | 9 MB | 9 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YEH TSUNG MING](https://appshunter.io/developer/324655388) | [CIHAN AKGUL](https://appshunter.io/developer/1733495147) |

## 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

**In-app purchases:** none


### Air Quality Tracker

[App page](https://appshunter.io/ios/app/air-quality-tracker-pureair/id6761026756)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Weekly Trial | $3.99 | per 7 days |
| Monthly | $6.99 | per month |
| Yearly | $24.99 | per year |


## Frequently asked questions

### Is PM2.5台灣 free?

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

### Is Air Quality Tracker free?

Air Quality Tracker is free to download, with in-app purchases available.

### Do PM2.5台灣 or Air Quality Tracker have ads?

Neither PM2.5台灣 nor Air Quality Tracker shows ads.

### Which is updated more often, PM2.5台灣 or Air Quality Tracker?

PM2.5台灣 ships an update every 2 weeks, and Air Quality Tracker every 3 days. Most recently, PM2.5台灣 was updated on November 1, 2026 and Air Quality Tracker on November 5, 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.*