Comparing the levels of pollution in different urban locales
The materials required for this science project are as follows:
- 8 pieces of cardboard that are of the dimensions 295mm x 210mm
- a pair of scissors
- 1 roll of transparent masking tape
- 8 pieces of wood that are 1.5 meters long each
- 16 nails
- 1 hammer
- 1 measuring tape
- 1 ruler
- 1 microscope
- 1 marker pen
- a sheet of graph paper
1. For this experiment, the independent variable is the location at which the collection board is placed. It is to be placed at a city park, a school, a market, a city bus station, the city hall, a hospital, a building top and at home. The dependent variable is to be the number of the particles that the board traps. Count how many particles are trapped using a microscope. The constants (control variables) are to be the relative amount of traffic each area experiences (ie: for example, do not visit one area on a busy day, and another on a quiet day.), the weather conditions in each area (wind direction, sunshine or rain), and the height and size of the collection board.
2. Cut a 5cm x 5cm opening or window in the middle of the pieces of cardboard. Place a layer of masking tape on 1 side of each piece of cardboard. The sticky side of the tape should be visible on the other side of the cardboard. Nail the cardboards to one end of the wooden sticks.
3. The wooden sticks together with the cardboard are to be placed in within the grounds of a city park, a school, a market, a city bus station, the city hall, a hospital, a building top and in a home. The collection boards should be approximately 1m above the ground. Leave the boards undisturbed for 3 days.
4. After 3 days, separate the collection boards and their wooden stands. Place each board is then placed over a sheet of graph paper and view the board under the microscope. Count how many particles found per each square centimeter and record this in the table below.