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Missing 3-year-old boy found dead in creek in Mississauga, Ont.: police
A three-year-old boy has been found dead a day after he went missing in a park in Mississauga, Ont., Peel police say.
A new joint study says that without mask wearing, a two-metre physical distancing guideline may not be enough to prevent the spread of COVID-19 indoors, however, wearing a mask can reduce the contamination range of airborne particles by approximately 67 per cent.
The study, published in the December volume of the journal Building and Environment, was conducted by researchers at McGill University, Universite de Sherbrooke, Texas A&M University, and Northern Illinois University. The research was based on models that examined the flow of liquids and gasses in indoor spaces using a computer program that accurately simulated coughing dynamics.
“Mask mandates and good ventilation are critically important to curb the spread of more contagious strains of COVID-19, especially during the flu season and winter months as more people socialize indoors,” said study author Saad Akhtar in a release.
Coughing is one of the main sources of spread of airborne viruses from symptomatic individuals, and currently, most public health guidelines recommend a distance of two metres for physical distancing between people who are not from the same household to address this.
However, the study found that when people are unmasked, more than 70 per cent of airborne particles pass the two-metre threshold within 30 seconds. By comparison, less than one per cent of particles cross the two-metres mark if masks are worn.
Coughing simulations run by the study found that particles can reach distances as far as five metres away or more if the person is unmasked and depending on ventilation and air conditioning.
The effect of wearing a mask is seen in this coughing simulation (McGill University)
The effect of mask wearing indoors on the spread of particles over a 30 second interval can be seen here in a coughing simulation run by the joint study. (McGill University/ Building and Environment Journal)
The study found that ventilation, a person’s posture, and mask-wearing impacted the spread of particles significantly, but age and gender had only marginal impacts.
“This study advances the understanding of how infectious particles can spread from a source to its surroundings and can help policymakers and governments make informed decisions about guidelines for masks and distancing in indoor settings,” Akhtar said.
A three-year-old boy has been found dead a day after he went missing in a park in Mississauga, Ont., Peel police say.
Against the rainy Paris night sky, Celine Dion staged the comeback of her career with a powerful performance from the Eiffel Tower to open the Olympic Games.
Premier Danielle Smith said Friday afternoon in Hinton while weather conditions are cooler, the Jasper fire is still considered out of control and that Jasper residents can expect to be away from their homes 'for several weeks.'
An Irish museum will withdraw a waxwork of singer-songwriter Sinéad O'Connor just one day after installing it, following a backlash from her family and the public, it told CNN in a statement on Friday.
A Winnipeg senior is getting soaked with a six-figure water bill.
Nearly two weeks after Donald Trump’s near assassination, the FBI confirmed Friday that it was indeed a bullet that struck the former president’s ear, moving to clear up conflicting accounts about what caused the former U.S. president’s injuries after a gunman opened fire at a Pennsylvania rally.
Orillia OPP arrested and charged a driver with impaired driving after flashing their high beams.
The lawyer for a former judge whose claims to be Cree were questioned in a CBC investigation says his client is not considering legal action against the broadcaster after the Law Society of British Columbia this week backed her claims of Indigenous heritage.
Scotiabank says it has fixed a technical issue that impacted direct deposits on Friday morning.
As fire threatened people in Jasper National Park, Colleen Knull sprung into action.
Video posted to social media on Thursday morning appears to show the charred remains of a Jasper, Alta., neighbourhood.
A Saskatchewan-born veteran of the Second World War was recently presented with France's highest national order.
A local First Nations elder and veteran is helping to bring the Ojibwe language to a well-known film for the first time.
A cat who fled her Montreal home nearly a decade ago has been reunited with her family after being found in Ottawa.
A woman in Waterloo, Ont. is out thousands of dollars for a car crash she wasn’t involved in.
A swarm of bees living in a lamppost in Winnipeg’s Sage Creek neighbourhood has found a new home for its hive.
Around 100 acres of Manitoba Crown Land near the Saskatchewan border is being returned to the Métis community.
Nova Scotia is suspending the licensed Cape Breton moose hunt for three years due to what the province is calling a “significant drop” in the population.