Systems for ensuring clean and infection-free spaces are critical especially now. Many of the air filtration solutions on the market are also not effective resulting in false sense of security and many serious building contamination problems. There is also evidence that when not optimized, air conditioning systems can accelerate the spread of infection. WeavAir offers continuous data-driven solution composed of plug & play multi-sensor IoT devices that measure 20 different metrics at 95% accuracy and predictive software to enable fast & accurate decisions and autonomous systems. WeavAir helps operators save up to 30% of operation and maintenance costs, save up to 60% of energy, and make better decisions to control of the spread of airborne contaminants and infection like COVID-19 while reducing liability and downtime. Our data can also be integrated with ventilation control systems, ERP systems and automation platforms. The ROI of the system is less than 2 years and can save over US$ 300K per installation per year.