Air Pollution

Air Pollutants

1. Carbon Dioxide (CO₂)

  • What it is: A greenhouse gas.

  • Sources: Fossil fuel combustion, deforestation, respiration.

  • Effects on humans: Indirectly contributes to climate change, which increases heat-related illnesses and the spread of disease.

  • Secondary pollutant? No, but contributes to global warming.

  • Reduction methods: Renewable energy, carbon capture, reforestation, energy efficiency.

2. Sulfur Dioxide (SO₂)

  • What it is: A toxic gas with a strong odor.

  • Sources: Burning fossil fuels (coal, oil), volcanic eruptions, industrial processes.

  • Effects on humans: Irritates lungs, worsens asthma, causes respiratory problems.

  • Secondary pollutant? Yes, contributes to acid rain.

  • Reduction methods: Scrubbers in power plants, low-sulfur fuels, renewable energy.

3. Nitrogen Oxides (NOₓ)

  • What it is: A group of gases, including NO and NO₂.

  • Sources: Vehicle emissions, power plants, lightning.

  • Effects on humans: Respiratory issues, contributes to smog and acid rain.

  • Secondary pollutant? Yes, forms ozone and acid rain.

  • Reduction methods: Catalytic converters, public transportation, renewable energy.

4. Particulate Matter (PM)

  • What it is: Tiny particles suspended in the air.

  • Sources: Dust, combustion, construction, wildfires.

  • Effects on humans: Causes lung disease, heart problems, and premature death.

  • Secondary pollutant? Some forms, like PM from chemical reactions.

  • Reduction methods: Air filters, emissions control, dust suppression methods.

5. Lead (Pb) (Outdoor & Indoor)

  • What it is: A toxic heavy metal.

  • Sources: Old gasoline, industrial processes, lead-based paint.

  • Effects on humans: Brain damage, developmental issues, kidney problems.

  • Secondary pollutant? No.

  • Reduction methods: Lead-free gasoline, proper waste disposal, regulation of industrial emissions.

6. Carbon Monoxide (CO) (Outdoor & Indoor)

  • What it is: A colorless, odorless gas.

  • Sources: Incomplete combustion of fuels, car exhaust, faulty heaters.

  • Effects on humans: Reduces oxygen in blood, causes dizziness, death at high levels.

  • Secondary pollutant? No.

  • Reduction methods: Proper ventilation, carbon monoxide detectors, catalytic converters.

7. Volatile Organic Compounds (VOCs) (Outdoor & Indoor)

  • What it is: A group of organic chemicals that vaporize easily.

  • Sources: Paints, cleaning products, vehicle emissions, industrial processes.

  • Effects on humans: Headaches, nausea, long-term cancer risk.

  • Secondary pollutant? Yes, helps form ozone and smog.

  • Reduction methods: Low-VOC products, proper ventilation, pollution controls.

8. Radon-222 (Indoor)

  • What it is: A radioactive gas.

  • Sources: Natural decay of uranium in soil, enters through cracks in buildings.

  • Effects on humans: Lung cancer risk.

  • Secondary pollutant? No.

  • Reduction methods: Ventilation, radon detectors, sealing cracks in foundations.

9. Asbestos (Indoor)

  • What it is: A fibrous mineral.

  • Sources: Old insulation, building materials.

  • Effects on humans: Causes lung disease and mesothelioma.

  • Secondary pollutant? No.

  • Reduction methods: Professional removal, avoiding disturbance of asbestos-containing materials.

10. Dust (Indoor)

  • What it is: Tiny solid particles in the air.

  • Sources: Skin cells, dirt, pollen, construction.

  • Effects on humans: Aggravates allergies and respiratory conditions.

  • Secondary pollutant? No.

  • Reduction methods: Air filters, regular cleaning, humidifiers.

11. Mold (Indoor)

  • What it is: A type of fungus.

  • Sources: Damp environments, leaks, high humidity.

  • Effects on humans: Allergies, respiratory issues, toxic mold syndrome.

  • Secondary pollutant? No.

  • Reduction methods: Dehumidifiers, proper ventilation, mold-resistant materials.

12. Formaldehyde (Indoor)

  • What it is: A toxic chemical.

  • Sources: Furniture, building materials, adhesives.

  • Effects on humans: Eye irritation, respiratory issues, cancer risk.

  • Secondary pollutant? No.

  • Reduction methods: Ventilation, low-formaldehyde products, air purifiers.

Air Pollution Reduction Methods Flashcards

1. Vapor Recovery Nozzle

  • What it is: A gas pump nozzle that captures fuel vapors.

  • How it works: Prevents VOCs from escaping into the air.

  • Pollutants reduced: VOCs.

  • Common uses: Gas stations.

2. Catalytic Converter

  • What it is: A device in vehicles that reduces emissions.

  • How it works: Converts CO, NOₓ, and VOCs into less harmful gases.

  • Pollutants reduced: CO, NOₓ, VOCs.

  • Common uses: Cars and trucks.

3. Wet Scrubbers

  • What it is: A pollution control device using liquid to remove pollutants.

  • How it works: Pollutants dissolve or react with water.

  • Pollutants reduced: SO₂, PM.

  • Common uses: Power plants, factories.

4. Dry Scrubbers

  • What it is: A device that uses dry chemicals to remove pollutants.

  • How it works: Chemicals neutralize harmful gases.

  • Pollutants reduced: SO₂, acid gases.

  • Common uses: Industrial plants.

5. Electrostatic Precipitators

  • What it is: A device that removes PM from exhaust gases.

  • How it works: Uses an electric charge to attract particles.

  • Pollutants reduced: PM.

  • Common uses: Power plants, cement factories.

Chemical Reactions and Explanations

Photochemical Smog Formation

  • Normal Ozone Formation:
    O2+UV→2OO2​+UV→2O
    O+O2→O3O+O2​→O3​

  • Smog Formation:
    NO2+UV→NO+ONO2​+UV→NO+O
    O+O2→O3O+O2​→O3​
    NO+O3→NO2+O2NO+O3​→NO2​+O2​

Stratospheric Ozone Depletion

  • Ozone Formation:
    O2+UV→2OO2​+UV→2O
    O+O2→O3O+O2​→O3​

  • Ozone Breakdown by CFCs:
    Cl+O3→ClO+O2Cl+O3​→ClO+O2​
    ClO+O→Cl+O2ClO+O→Cl+O2​

Acid Rain Formation

  • From Sulfur Dioxide:
    SO2+O2→SO3SO2​+O2​→SO3​
    SO3+H2O→H2SO4SO3​+H2​O→H2​SO4​

  • From Nitrogen Dioxide:
    NO2+H2O→HNO3NO2​+H2​O→HNO3​

Thermal Inversion

  • Explanation: A layer of warm air traps pollutants near the ground.

Noise Pollution Impacts

  • Humans: Hearing loss, stress, sleep disturbances.

  • Wildlife: Disrupts communication, hunting, and reproduction.