fig. 00 Case study In progress

Ticket to Breathe

The €9 experiment

Did nearly-free public transport clean Germany’s air?

Germany + 7 control countries

PythonDuckDBdbtLightGBMCausal inference

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fig. 01

A natural experiment

Policy dates only, nothing measured.

fig. 02

Three questions

fig. 03

How it works

fig. 04

Decisions

fig. 05

Build log

fig. 06

Results