# 公害防止管理者大気1種対策 500問 vs 危険物乙種Pass

The clearest difference is in-app purchases: 公害防止管理者大気1種対策 500問 at none against 危険物乙種Pass's 1. 危険物乙種Pass's advantage is update cadence (every 9 days vs every 2 months). On ads, device support and iOS requirement there is nothing between them.

公害防止管理者大気1種対策 500問 ships an update every 2 months, 危険物乙種Pass every 9 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | 公害防止管理者大気1種対策 500問 | 危険物乙種Pass |
| --- | --- | --- |
| Price | — | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Size | 34 MB | 43 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [satoshi yoshida](https://appshunter.io/developer/1873856165) | [KANDK](https://appshunter.io/developer/1867080143) |

## What reviewers say

### 公害防止管理者大気1種対策 500問

[App page](https://appshunter.io/ios/app/1-500/id6775328790)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 公害防止管理者大気1種対策 500問 free?

Pricing for 公害防止管理者大気1種対策 500問 is not currently listed on the App Store.

### Is 危険物乙種Pass free?

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

### Do 公害防止管理者大気1種対策 500問 or 危険物乙種Pass have ads?

Neither 公害防止管理者大気1種対策 500問 nor 危険物乙種Pass shows ads.

### Which is updated more often, 公害防止管理者大気1種対策 500問 or 危険物乙種Pass?

公害防止管理者大気1種対策 500問 ships an update every 2 months, and 危険物乙種Pass every 9 days. Most recently, 公害防止管理者大気1種対策 500問 was updated on October 25, 2026 and 危険物乙種Pass on October 25, 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.*