Critical Environment Technologies
    Toxic Gases

    Nitric Oxide

    NO

    Nitric oxide (NO) is a colorless gas produced during combustion processes, lightning strikes, and biological processes. In the atmosphere, NO quickly oxidizes to nitrogen dioxide (NO₂). Together, NO and NO₂ are referred to as NOx—major contributors to smog and acid rain. Industrially, NO is used in chemical synthesis and semiconductor manufacturing. Medical applications include treatment of pulmonary hypertension in neonates. OSHA PEL is 25 ppm. Detection is relevant in automotive emissions testing, power plants, combustion research, and medical facilities using therapeutic NO.

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    Key Information

    Essential safety and exposure information for Nitric Oxide

    Health Effects

    • Respiratory irritation and damage at high concentrations. Combines with hemoglobin
    • reducing oxygen transport.

    Common Sources

    • Combustion engines
    • power plants
    • industrial processes
    • and welding operations.

    Exposure Limits

    OSHA PEL
    25 ppm
    NIOSH REL
    25 ppm
    ACGIH TLV
    25 ppm

    Regulatory Status

    OSHA PEL
    25 ppm TWA
    NIOSH REL
    25 ppm TWA
    IDLH
    100 ppm
    ACGIH TLV
    25 ppm TWA
    EPA
    Precursor to NAAQS pollutants
    DOT
    Class 2.3 Toxic Gas, UN1660

    Detection Requirements

    Sensor Technology
    Electrochemical
    Detection Range
    0-100 ppm (safety) or 0-1,000 ppm (process)
    Response Time
    <30 seconds (T90)
    Calibration Frequency
    Semi-annual
    Alarm Setpoints
    Low 15 ppm, High 25 ppm (OSHA PEL)

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