According to the Central Pollution Control Board, which particulate size is most harmful to human health?

Particulate matter (PM) is classified based on the diameter of the particles, and smaller particles are generally more harmful to human health because they can penetrate deeper into the respiratory system and can enter the bloodstream.

Particles with a diameter of 2.5 micrometers or less (often referred to as PM2.5) are particularly concerning. These fine particles can bypass the body's natural defense mechanisms and reach the lungs, causing respiratory issues, cardiovascular diseases, and other health problems. They can also carry toxic substances into the body, compounding their harmful effects.

While larger particles, such as those with diameters of 5 or 10 micrometers, may be harmful, they are less able to penetrate deeply into the lungs and bloodstream compared to the smaller PM2.5. Additionally, particles with a size of 1 micrometer are also included in the category of fine particulate matter, but PM2.5 specifically represents a significant health risk and is closely monitored by health authorities.

Therefore, PM2.5 is recognized as the most harmful particulate size to human health according to the Central Pollution Control Board and various health organizations, making it a critical focus in efforts to reduce air pollution and protect public health.