The group in charge of school buses for the province of Ontario is trying to assure parents that buses will be deep cleaned before school starts and cleaned twice a day after that.
The social distancing on a crowded school bus will be difficult to do. NDP Leader raised concerns that all children should wear a face mask and sit alone. In a recent demonstration on aboard a school bus, cardboard cut-outs of children were used to prove her point.
School Bus Ontario stated that it is also recommending that students wear a face mask at all times on the bus and sit one per seat if possible.

The Sparta Group of Toronto has created a disinfectant that can kill COVID-10 as well as other viruses. The product has been used in the trucking industry as a disinfectant and is now being tried with robots and drones to apply the product in buses and other areas.
School Bus Ontario also stated that drivers will also be wearing masks and gloves and taking extra precautions. Many school bus drivers are semi-retired and over the age of 60 and they also have concerns about the virus.
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https://www.cdc.gov/coronavirus/2019-ncov/downloads/cloth-face-coverings-information.pdf
https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/cloth-face-cover.html
https://www.bbc.com/future/article/20200504-coronavirus-what-is-the-best-kind-of-face-mask