In an publication titled, ‘ Cleaning and disinfection of environmental surfaces in the context of COVID-19 ,’ and released on May 16, 2020, the WHO said this is because “disinfectant is inactivated by dirt and debris and it is not feasible to manually clean and remove all organic matter from such spaces.” The WHO also advised against spraying porous surfaces, such as sidewalks and unpaved walkways, would be even less effective. “Even in the absence of organic matter, chemical spraying is unlikely to adequately cover all surfaces for the duration of the required contact time needed to inactivate pathogens. “Furthermore, streets and sidewalks are not considered to be reservoirs of infection for COVID-19,” it said. The WHO also warned that spraying disinfectants, even outdoors, can be harmful for human health. “Spraying individuals with disinfectants (such as in a tunnel, cabinet, or chamber) is not recommended under any circumstances. “This could be physically and...