How were these numbers computed?

CO₂ emissions
For train emissions, the map first uses EcoPassenger values. If EcoPassenger train CO₂ is missing, it uses the SBB Ecocalculator value where available.

For plane emissions, the map uses the following order:

1. EcoPassenger plane CO₂, if available;
2. SBB Ecocalculator plane CO₂, if available;
3. Atmosfair-based plane CO₂, if the other sources are missing.

EcoPassenger link

Travel times
For train travel time, the map either uses SBB, Rome2Rio or EcoPassenger traveling times.

For plane travel time, the map uses Rome2Rio traveling times.

Rome2Rio example link

Prices
Train prices are taken first from SBB, then from Rome2Rio. Plane prices are taken from Rome2Rio.

Policy logic
This map provides a simplified visualization of the USI air travel regulations and is intended as a guidance tool only. It does not replace the official policy rules or decision-making process.

In case of discrepancies or unclear cases, the official USI air travel regulations should always be considered the authoritative reference.

You can read the full policy here: USI air travel regulations

CO₂ budget assumption
We assume the goal of limiting global warming to 1.5 °C. If the remaining IPCC carbon budget of approximately 420 billion tons of CO₂ until 2050 is distributed across an average world population of 8.8 billion people, this corresponds to a maximum individual carbon budget of about 1.5 tons of CO₂ per person per year. Further information is available here: atmosfair – annual climate budget .



Project & development
Interactive map developed by Ursa Bernardic, Sustainability Coordinator at Università della Svizzera italiana (USI).
For questions: ursa.bernardica@usi.ch.

Acknowledgments
The author gratefully acknowledges the support of student assistant Robert Stoian in data collection, as well as valuable feedback from the SOSTA team.

Terms of use
This interactive map is provided for informational purposes only. Automated data extraction, scraping, or reuse of the dataset without prior permission is not permitted.

If you are interested in using the data for research or other purposes, please contact: sosta@usi.ch. Important: if you see an inconsistency, or would like that we add a city please send us an email: sosta@usi.ch.