What should you do to reduce the risk of carbon monoxide poisoning when stuck in a heavy traffic?

• Open all windows to increase ventilation
• Turn on the air conditioning system
• Close the fresh-air vent
  Explanation:

  "Closing the fresh-air vent in congested traffic helps prevent the intake of outside air, which may contain high levels of carbon monoxide from surrounding vehicles' exhaust fumes, thereby reducing the risk of carbon monoxide poisoning."
• None of the above