NO2 (NO₂)
Nitrogen Dioxide
Toxic reddish-brown combustion gas that causes acute airway inflammation.
What is NO2 (Nitrogen Dioxide)?
Nitrogen Dioxide (NO₂) is an oxidizing toxic gas formed during high-temperature combustion of fossil fuels. Major sources include vehicle exhaust, gas appliances, and diesel generators. When inhaled, it deepens bronchial sensitivity and reacts in sunlight to form secondary ground-level ozone and toxic nitrate aerosols.
- •Unvented gas stoves, ovens, and space heaters
- •Tobacco smoke and attached parking garages lacking negative pressure
- •Automotive diesel and gasoline engine exhaust
- •Thermal power plants and industrial boilers
Health Effects of NO2
- •Bronchial hyper-responsiveness and shortness of breath
- •Throat constriction and intensified asthma attacks
- •Development of childhood asthma and chronic airway remodeling
- •Increased mortality from cardiovascular and respiratory conditions
Concentration Levels & Safety Guidelines
Standardized thresholds to identify when active ventilation and air filtration intervention is required.
Clean ambient air below international health risk thresholds.
Increased outdoor ingress from roadside traffic.
Direct bronchial irritation; exhaust mitigation and chemical filtration needed.
| Organization | Guideline Limit | Exposure Timeframe |
|---|---|---|
| World Health Organization (WHO) | 10 µg/m³ | Annual Mean Target |
| World Health Organization (WHO) | 25 µg/m³ | 24-Hour Target |
How DLE Measures NO2
NO₂ molecules diffuse through a porous membrane and are reduced at a catalytic working electrode, producing an electric current directly proportional to gas concentration.
Continuous toxic combustion gas telemetry.
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