Which of the following components if inhaled deep into the lungs can cause breathing and respiratory problems, irritation, inflammations and damage to the lungs and premature deaths?

According to Central Pollution Control Board (CPCB), particulate size 2.5 micrometers or less in diameter (PM 2.5) are responsible for causing the greatest harm to human health. These fine particulates can be inhaled deep into the lungs and can cause breathing and respiratory symptoms, irritation, inflammations and damage to the lungs and premature deaths.