Workers at Tesla's Austin factory reportedly faced temperatures as high as 100 degrees Fahrenheit and a constant haze due to a faulty furnace door.The door of a 30-foot furnace at the Texas plant remained stuck open for months, allowing pollutants to escape.A whistleblower memo revealed that Tesla used tactics to conceal the issue and pass emissions tests conducted by regulators.This incident adds to the growing scrutiny faced by Elon Musk's companies over environmental violations.