# 大気関係第１種 vs 公害防止Pass

The clearest difference is ads: 大気関係第１種 at none against 公害防止Pass's shown. On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. 大気関係第１種 sells 1 one-off in-app purchase and 公害防止Pass sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 大気関係第１種 | 公害防止Pass |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Weekly |
| Size | 5 MB | 43 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) | [KANDK](https://appshunter.io/developer/1867080143) |

## What reviewers say

### 大気関係第１種

[App page](https://appshunter.io/ios/app/id6758415098)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 大気関係第１種公害防止管理者 試験対策 | $1.99 | one-time |


### 公害防止Pass

[App page](https://appshunter.io/ios/app/pass/id6761719666)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $1.99 | one-time |


## Frequently asked questions

### Is 大気関係第１種 free?

大気関係第１種 is free to download, with in-app purchases available.

### Is 公害防止Pass free?

公害防止Pass is free to download, with in-app purchases available.

### Do 大気関係第１種 or 公害防止Pass have ads?

公害防止Pass shows ads; 大気関係第１種 does not.

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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.*