# PM2.5台灣 vs 空氣污染警報

The clearest difference is ads: PM2.5台灣 at none against 空氣污染警報's shown. PM2.5台灣 also leads on update cadence (every 2 weeks vs monthly) and iOS requirement (7.0 vs 16.1). On price, in-app purchases and device support 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, 空氣污染警報 monthly. The most recent releases landed on October 3, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | PM2.5台灣 | 空氣污染警報 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (5 ratings)](https://appshunter.io/ios/app/id6444897109/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free | — |
| Size | 9 MB | 55 MB |
| Requires iOS | **7.0** | 16.1 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YEH TSUNG MING](https://appshunter.io/developer/324655388) | [DoItWell Application Ltd](https://appshunter.io/developer/505381716) |

## 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


### 空氣污染警報

[App page](https://appshunter.io/ios/app/id6444897109)

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

**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 空氣污染警報 free?

空氣污染警報 is free to download, with no in-app purchases.

### Do PM2.5台灣 or 空氣污染警報 have ads?

空氣污染警報 shows ads; PM2.5台灣 does not.

### Which is updated more often, PM2.5台灣 or 空氣污染警報?

PM2.5台灣 ships an update every 2 weeks, and 空氣污染警報 monthly. Most recently, PM2.5台灣 was updated on October 3, 2026 and 空氣污染警報 on October 8, 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.*