Science project

Air Pollution


  • Microscope slides
  • Petroleum jelly
  • Microscope (at least 10x magnification)
  • Shoe boxes
  • Home furnace air filter


  1. Take a glass microscope slide and smear a thin layer of petroleum jelly on to the top surface ensuring the entire surface is coated.
  2. Place the slide in the areas you frequent:
    • Bedroom
    • Kitchen
    • Garage
    • Backyard
    • Classroom
    • Car
  3. Label your slides according to its location.
  4. Place the slides in an open area, where the air flows freely.
  5. Wait 1-2 days and collect your slides.
  6. Using a microscope examine the particles that were trapped by the petroleum jelly. Can you classify the particles? What percentage of the slide is covered?​
  7. Compare slides from the indoors vs. the outdoors.
  8. Compare slides between the rooms of your home.
  9. Organize your data in a chart.







Incubation Time

24 hrs

24 hrs

24 hrs

24 hrs

24 hrs

Particle Contents






% Coverage








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