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What gas makes up most of the air we breathe?
Nitrogen
Carbon dioxide
Oxygen
Which gas do humans need to breathe in to stay alive?
Nitrogen
Carbon dioxide
Oxygen
Which gas do we breathe out?
Carbon dioxide
Nitrogen
Oxygen
Why is nitrogen the most common gas in the air?
It is heavy
It does not react easily
Plants make it
Which of these is a harmful air pollutant?
Nitrogen
Smoke
Oxygen
Smoke from burning rubbish is an example of what?
Water vapour
Air pollution
Clean air
Which activity causes air pollution?
Rainfall
Planting trees
Burning fuels
Fumes from spray cans can pollute the air because they contain ____
Water droplets
Oxygen
Chemicals
Which gas increases in the air when many cars are on the road?
Oxygen
Carbon dioxide
Nitrogen
Which of these is a source of air pollution?
Cigarette smoke
Fresh air
Wind
Why is breathing polluted air harmful?
It can damage lungs
It makes air heavier
It helps lungs work better
What happens to air quality when pollution increases?
It stays the same
It becomes worse
It becomes cleaner
Which tool can be used to observe air pollution levels?
Thermometer
Rain gauge
Air quality sensor
When measuring air pollution, what is the dependent variable?
Type of place
Amount of pollution
Time of day
When testing air pollution near roads, what is the independent variable?
Location
Pollution level
Weather
Which variable should be kept the same (controlled) in an air pollution investigation?
Type of measuring tool
Distance from road
Number of cars
