Oﬃce personnel who are at higher risk of NO toxicity, to prevent this, the most  sensitive test for nitrous oxide detection is
Laminar ﬂow
Dosimeter
Infrared spectrophotometer
High suction speed
Periodic (i.e. semi-annual) sampling is done of dental personnel, especially chair-side personnel exposed to nitrous oxide (e.g. with a diffusive sampler, such as a dosimeter or infrared spectrophotometer)
Oﬃce personnel who are at higher risk of NO toxicity, to prevent this most sensitive test for nitrous oxide detection is Infrared spectrophotometer.
Reference: Pediatric Dentistry by Nikhil Marwah 3rd ed, page no 250