How does Spider-Man track chemical trails?

In Spider-Man PS4, Peter Parker has the ability to identify and track certain chemicals he comes across. The identification process is most likely a form of spectroscopy, probably Raman. But after identification, he has the ability to "key his lenses" to the "chemical signature". It then shows up on his HUD as a colored path. As far as I know, there are no technologies that can achieve this on such a distance. How does Spider-Man identify the chemical vapors on a distance?