---
title: "Green Index — full carbon dataset (L1/L2/L3)"
method: GET
path: "/carbon"
tags: ["Indices", "Public"]
---

# Green Index — full carbon dataset (L1/L2/L3)

`GET /carbon`

## Request

- Base URL: `https://opnplatform.com/api`
- URL: `https://opnplatform.com/api/carbon`
- Auth: none declared

Returns the complete Green Index carbon dataset:

- **L3:** kg CO2e per finished unit (Scope 3 cradle-to-gate)
- **L2:** kg CO2e per tonne of semi-finished intermediate
- **L1:** kg CO2e per tonne of raw material

Each entry has a grade (A-D vs layer peers) and carbon efficiency (kg CO2e per USD, L3 only). Sources: WRAP 2023, PlasticsEurope LCIA 2023, Ecoinvent 3.9, IAI 2023, World Steel 2023, BEIS 2024.

## Query parameters

- `layer` 'L1' | 'L2' | 'L3' | 'all'
- `code` string

## Response `200`

Carbon data by layer

- object
  - `l1` object
  - `l2` object
  - `l3` object

---

[API](https://skmtc.dev/opnplatform/apis/packindex-packiq-api-open-packaging-network.md) · [All operations](https://skmtc.dev/opnplatform/apis/packindex-packiq-api-open-packaging-network/llms.txt) · [OpenAPI document](https://skmtc.dev/opnplatform/apis/packindex-packiq-api-open-packaging-network/revisions/f427c0467bb2?raw)