2.5.5

Common Atmospheric Pollutants & Their Properties

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Common Atmospheric Pollutants from Fossil Fuels

Burning fossil fuels is a major cause of air pollution. Burning fossil fuels produces lots of carbon dioxide, as well as smaller quantities of other pollutants.

Incomplete combustion

Incomplete combustion

  • Incomplete combustion happens when fuels are burned in insufficient oxygen.
  • Incomplete combustion produces two problematic by-products:
    • Carbon monoxide - a toxic gas.
    • Particulates - small solid particles containing carbon and unburnt fuel.
Sulfur impurities

Sulfur impurities

  • Sulfur is an impurity that is present in all fossil fuels.
    • Sulfur oxidises when burned. This produces the toxic gas sulfur dioxide.
Internal combustion engines in cars

Internal combustion engines in cars

  • When fossil fuels are burned in a confined space, the high temperatures can cause nitrogen and oxygen to react.
    • This leads to the formation of toxic nitrogen oxides.

The Consequences of Atmospheric Pollutants

Common atmospheric pollutants include carbon monoxide, particulates, sulphur dioxide and nitrogen oxides. The negative effects of each of these are described here.

Carbon monoxide

Carbon monoxide

  • Carbon monoxide binds to haemoglobin in the blood.
    • This restricts the blood’s ability to transport oxygen throughout the body.
  • Carbon monoxide is odourless and colourless.
    • This means that it is difficult to detect in the air.
  • If exposed to too much carbon monoxide, symptoms can range from fainting to fatality.
Particulates

Particulates

  • Inhaling particulates can cause respiratory issues.
  • Particulates reflect incoming radiation out into space.
    • This leads to global dimming, which decreases the levels of sunlight available for photosynthesis. This can have knock-on effects for rainfall patterns.
Sulfur dioxide

Sulfur dioxide

  • Inhaling sulfur dioxide can cause respiratory issues.
  • Sulfur dioxide can react with water to form sulfuric acid.
    • Sulfuric acid is a major part of acid rain, which can cause:
      • The corrosion of steel.
      • The weathering of buildings, monuments and statues.
      • The death of insects, plants, and aquatic organisms.
Acid rain reaction

Acid rain reaction

  • Sulphur dioxide (SO2 causes acid rain. SO2 is oxidized to SO3. SO3 then reacts with water to form H2SO4.
    • SO3 + H2O → H2SO4
Nitrogen oxides

Nitrogen oxides

  • Inhaling nitrogen oxides can cause respiratory issues.
  • Nitrogen oxides can react with water to form nitric acid.
    • Like sulfuric acid, nitric acid is a key component in acid rain.
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Physical Chemistry

1.1

Atoms, Molecules & Stoichiometry

1.2

Atomic Structure

1.3

Chemical Bonding

1.4

States of Matter

1.5

Chemical Energetics

1.6

Electrochemistry

1.7

Equilibria

1.8

Partition Coefficient

1.9

Reaction Kinetics

2

Inorganic Chemistry

3

Organic Chemistry & Analysis

3.1

Introduction to Organic Chemistry

3.2

Hydrocarbons

3.3

Halogen Derivatives

3.4

Hydroxy Compounds

3.5

Carbonyl Compounds

3.6

Carboxylic Acids & Derivatives

3.7

Nitrogen Compounds

3.8

Polymerisation

3.9

Analytical Techniques

3.10

Organic Synthesis

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