What are the two valid indicators of indoor air quality? Why are there no other indicators available for indoor air quality?

The rest don't make sense so i say the first one.

Travel clerkdegree level: certificate or college degree preferred by employersdegree field: travel planning, travel, or tourism licensure and certification: business license may be required; voluntary certifications available construction carpenterrequired education: a high school dimploma and carpentry apprenticeship transportation managerdegree level: bachelor's degree in supply chain management or bachelor's degree in logistics degree field: supply chain management, systems engineering and business licence or certification: no legal requirement for a transportation to become certified but is recommended since certifications demonstrate commitment to excellence and a broader knowledge chief executive degree level: bachelor's degree; mba preferred degree field: liberal arts, business administration, public administration or field of specialty chosen (i.e health care administration)license or certificate: voluntary certification available

Native americans, the aboriginals of australia, sub-saharan african cultures

Cars should be kept indoors their entire life as to not get kidnapped, get diseases, run away from owner, or get eaten by a predator