Which one of the  following  is not  correct  with  regard to the harmful effects of particulate matter of the size 2.5 micro meters or less?

Inhaled particulates cannot directly reach the circulatory system. 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.