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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?
Oxygen
Nitrogen
Carbon dioxide
Which gas do we breathe out?
Carbon dioxide
Nitrogen
Oxygen
Why is nitrogen the most common gas in the air?
It does not react easily
Plants make it
It is heavy
Which of these is a harmful air pollutant?
Nitrogen
Oxygen
Smoke
Smoke from burning rubbish is an example of what?
Clean air
Air pollution
Water vapour
Which activity causes air pollution?
Burning fuels
Planting trees
Rainfall
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?
Wind
Fresh air
Cigarette smoke
Why is breathing polluted air harmful?
It helps lungs work better
It makes air heavier
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?
Location
Pollution level
Weather
Which variable should be kept the same (controlled) in an air pollution investigation?
Number of cars
Type of measuring tool
Distance from road
