Our Impact on Air and Water
Chapter 20
Air Pollution
Section 20.1
What are some causes of air pollution?
What are some causes of air pollution?
Human sources
Industry
Automobiles
Burning trash
Dust
Natural sources
volcanic eruptions
forest fires
What is smog?
What is smog?
Polluted air around cities
Haze
Smoke - fog
What are two types of smog?
What are two types of smog?
Photochemical
Sunlight reacts with chemicals in air
Brown color
Fossil fuels
Ozone - example
Sulfurous
Fossil fuel
Sulfur compounds
Gray smog
How can nature affect smog?
How can nature affect smog?
Sunlight
Calm weather patterns
Temperature inversion
Trapped by landforms - mountains
What is Acid Rain?
What is Acid Rain?
Rain is naturally acidity.
Rain or snow which is more acid than natural.
What causes acid rain?
What causes acid rain?
Sulfur dioxide sulfur dioxide burning of coal
Nitrogen oxides nitric acid - automobiles
How is acidity is measured?
How is acidity is measured?
pH scale
What is the pH scale?
What is the pH scale?
0 14
Below 7 acid
Above 7 base
7 - neutral
How does air pollution affect your health?
How does air pollution affect your health?
Eyes watery eyes, sting, blurred vision
Nose, throat, and lungs ozone - burning, reduces ability to fight infection
Heart carbon monoxide replaces oxygen in blood
Brain carbon monoxide replaces oxygen in blood
How does air pollution affect your health?
250,000 pollution related breathing disorders
60,000 deaths
What is particulate pollution?
What is particulate pollution?
Airborne solids
Smoke
Pollen
What law was passed in 1990 to protect air?
What law was passed in 1990 to protect air?
Clean Air Act
Air has improved
Cost in taxes and increased price
Acid Rain
Section 20.2
How does soil type affect acid rain damage?
How does soil type affect acid rain damage?
Basic soils are damaged less
What can be done to reduce acid rain?
What can be done to reduce acid rain?
Emission control devices on cars
Public transportation
Remove sulfur from coal
Use scrubbers
Use alternative fuels
Who should pay the cost of reducing sulfur dioxide emissions?
Water Pollution
Section 20.3
List 5 water pollutants and their sources.
List 5 water pollutants and their sources.
Bacteria and viruses
raw sewage from cities
Leaky septic tanks
Radioactive materials
Leaks from nuclear power plants
Radioactive waste dumps
List 5 water pollutants and their sources.(cont.)
Pesticides, herbicides, and fertilizers
Farms
lawns
Oil
Motor oil from car changes
Mine pollutants
List 5 water pollutants and their sources.(cont.)
Chemicals
From factories
Wastes from landfills
Legal pollution
Toilets
Wash hands
Brush teeth
Water lawns
How can water pollution be reduced?
How can water pollution be reduced?
International cooperation
Canada and US 1970 Lake Erie
Laws
Give two laws to control Water pollution?
Give two laws to control Water pollution?
Safe Drinking Water Act 1986
Clean Water Act 1987 gave money to states to build sewage and wastewater treatment facilities
What can you do to protect water from pollution?
What can you do to protect water from pollution?
Safe disposal of wastes
Paint
Motor oil
Conserve energy and water
Less fuel less acid rain
Less nuclear waste
Conserve water
