Facility: Tridel – Thermal and electrical waste recovery plant https://www.tridel.ch/fr/fonctionnement-de-lusine Location : Lausanne, Switzerland Reason for selecting this activity: The plant is visible from my apartment and just 5 minutes walking distance. What did you want to find out: This waste recovery plant is burning non-recyclable rubbish 24/7, generating power and hot water for Lausanne. How clean is the air coming out of the chimney? What did you learn: Thanks for various steps to capture pollutants resulting from combustion, the gases released from the chimney at 140°C comply with the requirements of Swiss legislation and are largely under the permitted values (all below 20% except nitrogen dioxide at approx 45%). A smoke analyzer constantly monitors the quality of gas emissions.