New research has found that burning “smokeless” or low-smoke fuels may be causing new air pollution hazards on streets and in homes. Sold as alternatives to burning coal, wood and peat at home, tests reveal their smoke contains large quantities of tiny ultrafine particles, that can deposit themselves deep in our lungs. The findings were an accidental discovery while researchers were testing fuels in traditional and modern eco design stoves. As expected, burning alternative fuels, both smokeless coal ovoids and briquettes made from olive stones, produced less particle pollution compared with wood or coal. …For each kilogram burned, the low-smoke fuels produced between two and three times more ultrafine particles than wood or coal. …The size of the ultrafine particles means that they are deposited deep in the lungs, multiplying the health impact. In Dublin, the low smoke fuels accounted for more than half of ultrafine particles that can deposit in people’s lungs.