At this stage, it's evident that the primary mode of SARS-Cov-2 transmission is through aerosols, not droplets nor fomites.

The level of air pollution affects the duration of suspension of bioaerosols as well as the performance of the innate immune system. Low humidity is also linked to higher transmission.

See

https://www.medrxiv.org/content/10.1101/2021.01.04.21249249v... https://www.medrxiv.org/content/10.1101/2020.10.19.20215236v... https://www.medrxiv.org/content/10.1101/2020.04.07.20057216v...