Too bad you can't simply whip out your Tricorder to make a quick environmental analysis.
Of course, performing a meaningful IAQ investigation is a bit more difficult. There is no "magic" instrument to simply analyze an indoor environment and print out a diagnosis on the spot! What is required will involve a carefully thought-out investigative plan, carefully-conducted investigative work in the field that may include direct-read measurements and collected samples for laboratory analysis, and thorough documentation.
Consultant Jack Springston discusses his methodology for Performing an Indoor Air Quality Assessment in the September cover story for Healthy Indoors Magazine. According to Springston in his article, "Often, individuals will approach a problem with their own preconceived notions on what is causing the issue, and then go about doing testing to prove that they are correct." There is a better way of doing things!
You can read the complete article in the publication's September 2017 digital edition now at: https://healthyindoors.com/magazine/