
Grade indoor CO2 (ppm) against EN 16798-1 or another CO2-based IAQ standard.
| Name | Nickname | Description | Type |
| Indoor CO2 | C | Indoor CO2 concentration(s) in ppm. | Number |
| Outdoor CO2 | O | Outdoor background in ppm. One value, or one per indoor reading. | Number |
| Standard | S | 0 EN 16798-1, 1 LEHB (JP), 2 SS 554 (SG), 3 HK EPD, 4 UBA (DE), 5 DOSH (MY), 6 NBR (BR). | Integer |
Output
| Name | Nickname | Description | Type |
| Index | I | IAQ class, 1 = best. The worst value differs per standard — never compare across standards. | Integer |
| Class | L | The class name the standard itself uses. | Text |
| Source | Src | Citation of the source document. | Text |