You should use a pollution mask if you drive in and around polluted areas, and would like your lungs to work at full capacity. An active carbon pollution mask will prevent coughing, improve your breathing, and enhance your health.
The most polluted times are during morning and evening rush hour. You should use a pollution mask to feel more comfortable while driving behind buses, cars and motorcycles which emit black smoke. More concentrated pollution is found in this CO2.
Dust is a major issue in an around polluted areas, and PM2.5 dust particles will cause chest pain and less lung capacity in the long term.
Choosing to protect your lungs is a very wise choice.