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