Indoor and outdoor factors combine to make asthma worse

Co-exposure to elevated levels of endotoxin from house dust and ambient air pollutants appears to have a synergistic impact on respiratory health, a US study suggests. The study measured endotoxin levels from bedding and bedroom samples and average particulate matter (PM2.5), ozone and nitrous dioxide levels at the homes of 6,488 participants. It found PM2.5, ...