1.
The most abundant gas in the atmosphere, making up approximately 78% of air.
2.
The abbreviation for the index used in Singapore to measure and describe air quality.
3.
This condition is often caused by forest fires and can spread over long distances via wind.
4.
haze can cause ________ to our eyes, nose and throat.
5.
Harmful substances that pollutes the air.
6.
The gas that makes up 21% of the atmosphere and is essential for the survival of living things.
7.
A poisonous gas (Carbon ________) formed during the incomplete burning of fossil fuels.
8.
Formed when sulfur dioxide or nitrogen oxides dissolve in rainwater.
9.
______ matter such as soot is produced during forest fires.
10.
Burning of ______ fuels release pollutants into the air.
11.
Natural phenomena that causes formation of nitrogen oxides.
12.
Such activities are not advisable during a haze.
13.
What acid rain can do to statues and buildings over time
14.
The process of burning waste in special plants, which we should aim to reduce
15.
A method to reduce the number of vehicles on the road.
16.
Type of car that utilise other sources of energy other than fossil fuels.
17.
Industrial plants should install these to reduce the amount of pollutants released.
18.
Packaging materials that can be broken down naturally by bacteria, helping to reduce waste
