There’s growing concern about a new category of unregulated airborne pollutants, so tiny they can pass through the lungs and into the bloodstream. For The National, CBC’s Ashley Fraser explains ultrafine particles (UFPs) and why scientists say they have the potential to cause major health problems.

Air Pollution is recognized as a serious threat to health. But while Canada has set standards for certain types of air pollutants, a microscopic particle, a thousand times thinner than a strand of hair, remains unregulated and is playing havoc with our health. Let’s be the first country to regulate ultrafine particles – a serious air pollutant linked to damaging health effects.