Sunlight, heat and humidity weaken coronavirus, US official says | GMA News Online gmanetwork.com

US government researchers have determined that the virus survives best indoors and in dry conditions, and loses potency when temperatures and humidity rise – and especially when it is exposed to sunlight, said William Bryan, acting head of the US Department of Homeland Security's Science and Technology Directorate.

According to Bryan, "The virus dies quickest in the presence of direct sunlight." On nonporous surfaces like stainless steel, the virus takes 18 hours to lose half its strength in a dark, low-humidity environment. In a high-humidity environment, that half-life dropped to six hours, and when the virus was exposed to high humidity and sunlight, the half-life dropped to two minutes.

President Donald Trump, however, said the findings should be interpreted cautiously.