Design, installation, repair, and maintenance of air purifier systems and equipment, ventilation systems and equipment, and indoor air quality monitoring systems and equipment for properties and buildings; Consulting services in the field of air quality assessment, air quality measurement, air quality monitoring, air quality improvement, and air quality planning for properties and buildings; Restaurant and bar services; Educational services in the nature of preschools, elementary schools, middle schools, high schools, universities, or colleges; Educational services, namely, conducting live and online classes, exhibitions, seminars, workshops, conferences, training, and courses in the field of air quality assessment, air quality measurement, air quality monitoring, air quality improvement, and air quality planning for properties and buildings