Here, there is a good paper just came out. Published on PNAS, a good scientific journal.
We have been wondering how long those tiny droplets from our speech can linger in the air. An interesting paper. I attach the paper.
The title is: " The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission. ""The simple act of speaking can emit small droplets that linger in the air for at least eight minutes and potentially much longer (8-14 minutes). This could help explain why COVID-19 cases cluster in places with poor air circulation, such as nursing homes, households and cruise ships." (The Washington Post)
European Air Quality information in support of the COVID-19 crisis
”The information is based on Oxford University’s coronavirus government response tracker. Altogether, these timeseries provide information on how background air pollution has evolved over the weeks since the beginning of the COVID-19 outbreak.
You can find surface concentration analysis data here: https://github.com/CopernicusAtmosphere/air-quality-covid19-response”
The new coronavirus, SARS-CoV-2, is tiny, about 0.1 microns - roughly 4 millionths of an inch - in diameter. Aerosols produced by people when they breathe, talk and cough are generally between about 0.7 microns to around 10 microns – completely invisible to the naked eye and easily able to float in air. These particles are mostly biological fluids from people’s mouths and lungs and can contain bits of virus genetic mate