How to Put a fine layer of petroleum jelly inside the jar or cup Place outdoors at least three feet off the ground (so nothing gets kicked into it) Wait one week and make an observation, record your findings Check again every week for one month, record what you observed.
Comparing Air Quality Repeat the experiment in different areas. Place one plate near a railroad track, one in the woods, one on your back porch. Where else can you put one to test quality? Where do you think the air will be the cleanest? Why?
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