I saw videos of some countries driving trucks doing a sort of fogging and spraying of whole outdoor areas. Not unlike in the article here.

It seemed like a strange practice to combat a virus to me but when I raised the question I was told various things that I found pretty unconvincing.

I'm glad to see some actual work identifying risks is out there now.

I suspect surfaces, like other practices are focused on, because we can easily deal with them. Anyone can disinfect a surface. The air, not as easy unfortunately.