COVID-19 and as such, the province is required under the Ontario Occupational Health and Safety Act to implement all reasonable measures to reduce the risks posed by the virus.[ Sign up for our Health IQ newsletter for the latest coronavirus updates ]They allege the provincial plan fails to provide adequate health and safety protections such as smaller class sizes, minimal measurable standards for ventilation in schools, and mandatory masking for younger children.The unions — the Association des enseignantes et des enseignants franco-ontariens, the Elementary Teachers’ Federation of Ontario, the Ontario English Catholic Teachers’ Association and the Ontario Secondary School Teachers’ Federation — represent more than 190,000 teachers and.