While the study provided evidence that transmission of Ebola between species is possible, researchers still cannot say for certain how that transmission actually occurred. There are three likely candidates for the route of transmission: airborne, droplet, or fomites.
Author Dr. Gary Kobinger suspects that the virus is transmitted through droplets
What do these findings mean? First and foremost, Ebola is not suddenly an airborne disease. .... Furthermore, because human Ebola outbreaks have historically been locally contained, it is unlikely that Ebola can spread between humans via airborne transmission.
The Gross Science of a Cough and a Sneeze
What I do understand is that ebola is not as resilient on surfaces as say the flu can be. Ebola likes wet warm environments and at least in the US, the seasonal change in some of the country will be very hostile to Ebola should it get on a surface outside. Inside, the humidity commonly drops in the norther tier of states so dry heat will also not be very helpful to Ebola.
“I think if Thomas Jefferson were looking down, the author of the Bill of Rights, on what’s being proposed here, he’d agree with it. He would agree that the First Amendment cannot be absolute.” - Chuck Schumer (D). Yet, Madison and Mason wrote the Bill of Rights, according to Sheila Jackson Lee, 400 years ago. Yup, it's a fact.
Review of Human-to-Human Transmission of Ebola Virus | Ebola Hemorrhagic Fever | CDC
It appears the primates were 20cm from the pigs, and pigs can generate large droplets very effectively. In other conditions - such as when a plexiglass barrier prevented large droplets, but wouldn't contain the small ones you refer to, there was no transmission. And in studies of humans, in the VAST majority of cases, the person infected is known to have directly contacted human bodily fluids, and indirect transmission can't be confirmed but is in any event very rare. That's consistent with the cases here where it's only healthcare workers directly treating the dying patient who got sick, and not other bystanders, including family members living in the same home.