Nitrogen Dioxide Detectors: Rent or Buy
Nitrogen dioxide (NO₂) is a reddish-brown, acrid gas produced during combustion, welding, arc cutting, blasting operations, and the use of gas-powered equipment in confined spaces. It is also generated in agricultural silos (silo gas), chemical manufacturing, and during nitric acid production.
PICK HOW YOU NEED TO MONITOR
Detectors to Rent for Nitrogen Dioxide
Personal monitors are worn in each worker's breathing zone and alarm on their exposure. Area monitors watch a fixed point, room or job site. Pick a style below, then compare every option in the table.
Top pick
Add-ons, kits and consumables
COMPARE OPTIONS
Nitrogen Dioxide detectors side by side
| Instrument | Monitoring | Detection method | Range | Resolution / lowest alarm | Gases at once | Sampling | Battery run time | Intrinsically safe | Data logging | Starting at |
|---|---|---|---|---|---|---|---|---|---|---|
| Multi-Gas Monitors Read several gases at once from interchangeable sensors, worn on the body or set down as an area monitor. The sensors fitted decide which gases they read. | ||||||||||
| MultiRAE family (4 models) MultiRAE Lite PIDMultiRAE P2PMultiRAEMultiRAE Lite CO2Top pick | Personal + Area | Electrochemical | 0 to 20 ppm | 0.1 ppm | Up to 5 sensors | Internal pump | Approx. 12 hours | Yes | Yes | $110–$140 / day |
| Single-Gas Personal Monitors Small clip-on detectors that read one gas in the worker's breathing zone and alarm at set levels. | ||||||||||
| PAC 8000 NO2 by Drager | Personal | Electrochemical | 0 to 50 ppm | 0.02 ppm | 1 | Diffusion (no pump) | Up to 24 months | Yes | Yes | $100.00 / day |
| ToxiRAE Pro by Honeywell RAE Systems | Personal | Electrochemical | 0 to 20 ppm | 0.1 ppm | 1 | Diffusion | Over 30 hours in normal operation | Yes | Yes | $55.00 / day |
| Tape-Based Gas Monitors Draw air across a chemically treated tape that changes color when the target gas is present. The tape cassette fitted decides which gases it reads. | ||||||||||
| SPM Flex by Honeywell Analytics | Area | Chemcassette colorimetric tape | 0.03 to 10 ppm | Lowest alarm 0.05 ppm | 1 cassette | Internal pump (sample line up to 100 ft) | 6+ hours under typical conditions | No | Yes | $315.00 / day |
| Combustion Analyzers Measure flue gas and engine exhaust for emissions testing and burner or engine tuning. | ||||||||||
| Testo 340 | Source | Electrochemical | 0–500 ppm | 0.1 ppm | — | Internal pump | Over 6 hours with pump on | No | Yes | $225.00 / day |
| Testo 350 | Source | Electrochemical | 0–500 ppm | 0.1 ppm | — | Internal pump | Approx. 2.5 hours at maximum load | No | Yes | $300.00 / day |
| Outdoor Monitoring Stations Weatherproof stations left on site for continuous perimeter or fenceline monitoring, with remote access to the data. | ||||||||||
| Aeroqual AQS1 Air Quality Monitor | Area | Electrochemical with integrated O3 filter and automatic baseline... | 0 to 500 ppb | 0.1 ppb | — | Internal pump | No internal battery. Runs on AC power | No | Yes | Request a quote |
For instruments that take interchangeable sensors or cassettes, range and resolution are for the NO₂ sensor or cassette. Run times are manufacturer estimates and vary with configuration and conditions. Not sure? Talk to our team.
WHERE EXPOSURE OCCURS
Risks: Where Nitrogen Dioxide Exposure Occurs
Nitrogen dioxide (NO₂) can build up in areas with diesel exhaust, propane-powered equipment, or hot work, creating an inhalation hazard in enclosed or poorly ventilated spaces. Rent NO₂ detection equipment from RAECO Rents to support spot checks and continuous monitoring in warehouses, maintenance shops, manufacturing areas, and during confined space entry. Rental instruments are bump tested and span calibrated before each rental.
Welding & arc cutting
Arc welding and cutting produce NO₂, especially in enclosed or poorly ventilated spaces.
Typical setup: Personal NO₂ monitors worn in the welder's breathing zone.
Engines & combustion equipment
Gas- and diesel-powered equipment running indoors or in confined spaces.
Typical setup: Multi-gas monitors with NO₂ and CO sensors, plus a combustion analyzer to check the equipment.
Agricultural silos
Freshly filled silos release NO₂ (silo gas) in the weeks after filling.
Typical setup: A personal NO₂ monitor before and during silo entry.
Blasting & tunneling
Explosives and diesel equipment produce NO₂ in tunnels and underground work.
Typical setup: Multi-gas monitors with an NO₂ sensor for crews at the work face.
EXPOSURE LIMITS
Nitrogen Dioxide exposure limits
- Ceiling5 ppm (9 mg/m³)
- STEL1 ppm (1.8 mg/m³)
- IDLH13 ppm
- TWA0.2 ppm (0.38 mg/m³)
TWA = 8-hour time-weighted average (NIOSH RELs are 10-hour). STEL = 15-minute short-term limit. IDLH = immediately dangerous to life or health. Updated October 8, 2026.
Nitrogen Dioxide monitoring questions
All rental FAQs →Not sure which nitrogen dioxide detectors fit your job?
Tell us where the hazard is and how many workers need coverage. We'll recommend the instrument, range and alarm settings.
For educational purposes only. Exposure limits are summarized from the cited agencies; confirm monitoring requirements for your site with a qualified safety professional.