Clean Shipping Index (CSI)
Cargo-owner-driven ranking covering CO₂, NOx, SOx, particulates, chemicals and waste. A–E letter grade per category; top-quartile scores earn shipper preference and port-fee discounts in participating ports.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| CO₂ per tonne-nm score (higher is better) | 0–100 | |
| NOx per kWh score | 0–100 | |
| SOx + PM score (sulphur + PM abatement) | 0–100 | |
| Chemicals score (antifouling, lubes, grey water) | 0–100 | |
| Waste-management score | 0–100 |
Source: Clean Shipping Index - *cleanshippingindex.com*; Smart Freight Centre (inheritor of Clean Cargo Working Group)
In short
Compute the Clean Shipping Index letter grade from per-category scores for CO₂, NOx, SOx, chemicals, and waste.