Epidemiology and Communicable Diseases, Scientist and Head at ICMR, Dr Raman R Gangakhedkar stated that if coronavirus would have been an airborne disease, then each member of the family of corona positive person would have been positive.

Apart from this, an expert committee has concluded that the novel coronavirus is aerosolized through talking or exhalation, but it's not yet clear if the viral particles are viable and emitted in doses sufficient to cause infection."While the current SARS-CoV-2 specific research is limited, the results of available studies are consistent with aerosolization of virus from normal breathing," wrote Harvey Fineberg, MD, PhD, chair of the National Academies Standing Committee on Emerging Infectious Diseases and 21st Century Health Threats, in a rapid expert consultation issued April 2.

Although aerosolization could be considered a third potential route of transmission — along with large droplets emitted from sneezing or coughing and the transfer of viral particles after touching a contaminated surface — the relative contribution of each mode is uncertain, said Fineberg.
It's also still unclear what it takes to cause infection through aerosolization, he said.

"The best approach without that clear description is all three are possible and we have to guard against all three," he said.(copied from source medicinenet.com)