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What gas makes up most of the air we breathe?
Nitrogen
Oxygen
Carbon dioxide
Which gas do humans need to breathe in to stay alive?
Nitrogen
Oxygen
Carbon dioxide
Which gas do we breathe out?
Nitrogen
Carbon dioxide
Oxygen
Why is nitrogen the most common gas in the air?
Plants make it
It does not react easily
It is heavy
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?
Planting trees
Rainfall
Burning fuels
Fumes from spray cans can pollute the air because they contain ____
Water droplets
Chemicals
Oxygen
Which gas increases in the air when many cars are on the road?
Oxygen
Nitrogen
Carbon dioxide
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 cleaner
It becomes worse
Which tool can be used to observe air pollution levels?
Rain gauge
Air quality sensor
Thermometer
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?
Weather
Pollution level
Location
Which variable should be kept the same (controlled) in an air pollution investigation?
Distance from road
Type of measuring tool
Number of cars
