Why is it illegal to tamper with pollution control devices in a vehicle?

• They enhance vehicle performance and power output
• They reduce the risk of damage to the vehicle
• They contribute to increased air pollution and reduce the efficiency of engine
  Explanation:

  "It is illegal to tamper with, remove, or cause not to work, any pollution control device on your vehicle. Tampering can cause damage to your vehicle, increased air pollution, lower gas mileage, less vehicle efficiency & breathing difficulties."
• They ensure better breathing conditions for the driver