# 危険物乙種Pass vs 公害防止管理者 大気1種 問題集

The clearest difference is update cadence: 公害防止管理者 大気1種 問題集 at every 4 days against 危険物乙種Pass's every 9 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 危険物乙種Pass sells 1 one-off in-app purchase and 公害防止管理者 大気1種 問題集 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

危険物乙種Pass ships an update every 9 days, 公害防止管理者 大気1種 問題集 every 4 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | 危険物乙種Pass | 公害防止管理者 大気1種 問題集 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 4 days** |
| Size | 43 MB | 32 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KANDK](https://appshunter.io/developer/1867080143) | [Takuro Fukuma](https://appshunter.io/developer/1896728656) |

## What reviewers say

### 危険物乙種Pass

[App page](https://appshunter.io/ios/app/pass-12356/id6777876022)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 危険物乙種Pass プレミアム | $1.99 | one-time |


### 公害防止管理者 大気1種 問題集

[App page](https://appshunter.io/ios/app/1/id6800551667)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全問解放（買い切り） | $6.99 | one-time |


## Frequently asked questions

### Is 危険物乙種Pass free?

危険物乙種Pass is free to download, with in-app purchases available.

### Is 公害防止管理者 大気1種 問題集 free?

公害防止管理者 大気1種 問題集 is free to download, with in-app purchases available.

### Do 危険物乙種Pass or 公害防止管理者 大気1種 問題集 have ads?

Neither 危険物乙種Pass nor 公害防止管理者 大気1種 問題集 shows ads.

### Which is updated more often, 危険物乙種Pass or 公害防止管理者 大気1種 問題集?

危険物乙種Pass ships an update every 9 days, and 公害防止管理者 大気1種 問題集 every 4 days. Most recently, 危険物乙種Pass was updated on November 5, 2026 and 公害防止管理者 大気1種 問題集 on November 6, 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.*