Smogathon aims to fight air pollution through technology. Start-ups will compete for $15 thousand in cash and a contract to implement their innovation in Krakow, Poland. Smogathon welcomes participation from any group worldwide that works as a registered company, start-up, foundation, or research group with a legal entity. The finalists will compete in Krakow during the Global Clean Air Summit. The deadline for applications is 10 November 2019. Link