See also:

Relative humidity
Corrosion will be accelerated in areas of high relative humidity, especially those areas where the temperatures stay above freezing and where atmospheric pollution exists and road salt is used. ...

Controls
Outside air circulation: Push the air recirculation button to turn off the indicator light on the button. The air flow is drawn from outside the vehicle. Air recirculation: Push the air recircu ...

Reporting safety defects (US only)
If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) ...