Give the following suggestions:
First, the car should be ventilated frequently, especially for new cars;
Second, you can put some bamboo charcoal in the car;
Third, the heating temperature in the car should not be adjusted too high;
Fourthly, the external circulation ventilation system should be used in areas with clean environment to purify the air inside the car, while the internal circulation system must be used when driving in areas with dirty external environment.
Fifth, frequent inspection and replacement of pollen filter screen and cleaning of air conditioning evaporation box can effectively remove the odor and bacteria in heating system.