Flu best friend is low humidity 🫠A study by the US National Institute for Occupational Safety & Health (NIOSH) found that keeping the relative humidity (RH) at 40% or higher can significantly reduce the spread of the flu. The study found that the flu virus was 71–77% infectious at RH levels of 23% or less, but only 15–22% infectious at RH levels of 43% or higher. A Yale research team found that low humidity can make people more likely to get sick or die from the flu during the winter. Low humid