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Chemical Name: Nitrogen Dioxide
Common Synonyms: NO2
CAS Number: 10102-44-0
Physical Description: This gas shows up as a reddish-brown cloud, and it hits your nose with a sharp, biting odor that nobody quickly forgets. Nitrogen dioxide drifts out of car exhaust, power plants, welding, and some fertilizer plants. I’ve seen tanks of this stuff in industrial parks, so anybody working with acids or high-heat processes in metal shops could run across it.
GHS Classification: Oxidizing, corrosive, toxic by inhalation
Acute Health Hazards: Leaves the lungs hurting and can make it hard to breathe; even a short encounter sometimes scars lung tissue for good. Regular exposure triggers breathing problems and can set off asthma.
Chronic Health Hazards: Damage from this gas doesn’t always heal even after exposure stops. Workers who deal with it over the years see long-term damage, coughing, short breath, and sometimes heart issues.
Environmental Hazards: NO2 doesn’t just hurt people, it’s rough on plants and smog-prone cities too, making ground-level ozone problems worse.
Name: Nitrogen Dioxide
Purity: Usually close to 100% in industrial and laboratory settings
Relevant Impurities: In some setups, small amounts of nitric oxide (NO) tag along.
Inhalation: Move affected people to fresh air right away. Don’t wait for symptoms to appear, since damage happens inside. Get medical help as soon as there’s any coughing, wheezing, or shortness of breath.
Skin Contact: Wash with soap and water to rinse off liquid or condensed NO2; for burns or skin irritation, think about seeing a doctor.
Eye Contact: Rinse well with water—fifteen minutes at least—since chemical burns come on fast.
Ingestion: Not common because this is a gas, but in case of exposure, seek help immediately rather than risk a delay.
Flammability: NO2 won’t catch fire itself, but it can help other things burn hotter by releasing extra oxygen.
Hazardous Combustion Products: Burning creates more nitrogen oxides, and these aren’t something you want drifting around in any fire.
Recommended Extinguishing Media: Spray water mist, foam, or dry chemical onto material that’s actually burning (since the gas helps, but isn’t itself catching ablaze).
Special Protective Equipment: Firefighters need self-contained breathing gear to stay clear of poison fumes.
Personal Precautions: Get people wearing respirators or supplied-air systems to handle leaks. A regular dust mask or cotton shirt won’t cut it.
Environmental Precautions: Seal off nearby drains—NO2 dissolves in water and turns into strong acids.
Containment and Cleanup: Ventilate the area, flood spilled areas with air, and keep people out until the gas clears. Call in a hazmat team if indoors or in tight areas because quick action makes a difference.
Safe Handling: Only trained staff should touch this stuff. Always open containers in hoods or outside, and keep it from heat and direct sunlight since both can build up pressure or trigger violent reactions.
Safe Storage: Keep tanks or cylinders upright, tied down, and shielded from impacts or knocks. I’ve walked by cylinders chained to cement walls for a reason—one tip can mean disaster.
Exposure Limits: OSHA and ACGIH recommend limits as low as 3 ppm averaged over short periods. Exposures are supposed to stay far below that—ideally under 1 ppm.
Engineering Controls: Pulling gases away with ventilation hoods or full building ventilation is the first line of defense.
Personal Protection: Well-fitted respirators, rubber or nitrile gloves, goggles or full face shields, and sturdy lab coats or aprons. There’s no excuse for cutting corners since even tiny leaks can do real harm.
Appearance: Deep red-brown gas, heavier than air, stings your eyes and nose
Odor: Acrid and biting—unique and impossible to mistake
Melting Point: -11°C
Boiling Point: 21°C
Solubility: Dissolves in water, creating a harsh acid called nitric acid
Vapor Pressure: High enough to leak out of open containers or loose seals, especially in summer
Density: At regular temperature and pressure, it carries about 1.88 times the weight of air—so it settles low.
Chemical Stability: This compound remains pretty stable at room temperature when kept dry and sealed tight.
Reactive Hazards: Contact with water creates acid. Heat, sparks, or strong reducing fuels can spark off wild reactions.
Incompatible Materials: Steering clear of bases, certain metals, organics, and flammables makes a difference in preventing runaways.
Hazardous Decomposition: Exposure to fire or metal chips means a risk of extra nitrogen oxides.
Routes of Exposure: Mostly through lungs, sometimes skin and eyes if liquid settles out.
Acute Effects: Causes coughing, chest pain, watery eyes, nausea, and—at high levels—life-threatening fluid in the lungs.
Chronic Effects: Permanent scarring of the lungs, ongoing breathing trouble, and higher odds of getting bronchitis or asthma.
Carcinogenicity: Studies in animals point to a risk, but right now it’s not listed as a human carcinogen.
Other Health Risks: Childrens’ lungs and folks with lung disease take the hit most—whole neighborhoods near highways or factories see higher asthma rates when the stuff gets loose.
Environmental Fate: NO2 transforms fast in the air, making acid rain and raising ozone near the ground.
Impact on Aquatic Life: When it finds water, acid forms and harms creatures in rivers and lakes.
Soil Impact: Acid from NO2 goes into the soil, changing nutrient levels and hurting sensitive plants.
Global Effects: NO2 and related gases add to the story of climate change and pollution. Cities that clean up exhaust and smokestacks prove air can turn fresh again over time.
Incineration and Neutralization: Industrial facilities scrub NO2 out of air and water using alkaline scrubbers—strong bases neutralize the acidic mix.
Regulatory Tips: Gases and liquids tainted with NO2 get classified as hazardous, which means no pouring down the drain and no shortcuts on disposal. Disposal outfits with permits take care of what workers can’t handle safely.
UN Number: 1067
Proper Shipping Name: Nitrogen Dioxide, Compressed
Hazard Class: 2.3 (toxic gas)
Special Precautions: Tanks ride in ventilated vehicles, upright, tightly secured. Labeling matters—nobody wants to mix up a nitrogen dioxide tank with plain air or carbon dioxide.
Workplace Standards: OSHA rules in the United States list detailed limits and emergency procedures. Europe, Canada, and most of Asia also control it tightly.
Environmental Laws: The Clean Air Act (US) and similar rules elsewhere make factories use scrubbers and track how much NO2 they let loose.
Hazard Communication: Labels and updated training for anyone close to NO2 aim to keep both workers and neighborhoods out of the danger zone.
Transport Regulations: National and international codes set out exactly how to ship tanks, dispose of waste, and step in if there’s a leak.
