9 Air quality sensors; carbon dioxide sensors; gas sensors; particulate matter sensors; temperature sensors; atmospheric humidity sensors; air analysis apparatus; analyzing apparatus and display terminals for particulate matter, temperature, atmospheric humidity, gas and carbon dioxide content; measuring apparatus for determining gas and carbon dioxide concentration, temperature, atmospheric humidity, and particulate matter; electronic instruments, namely, carbon dioxide, temperature, particulate matter, atmospheric humidity and gas monitors; concentration meters; Downloadable computer software, namely, downloadable computer software for controlling and monitoring air quality sensors, carbon dioxide sensors, gas sensors, particulate sensors, temperature sensors, atmospheric humidity sensors, air analysis apparatus, analyzing apparatus and display terminals for particulate matter, temperature, atmospheric humidity, and gas and carbon dioxide content, measuring apparatus for determining gas and carbon dioxide concentration, temperature, atmospheric humidity, and particulate matter, measuring apparatus for infectious disease testing, electronic instruments, namely, carbon dioxide, temperature, particulate matter, atmospheric humidity and gas monitors, concentration meters