Subject: What is a simple way to identify the different air pollutants in the air?

Dear Expert,
My name is Wenya, and I'm a grade 10 student. This year, my science fair 
will be on air pollution and what exactly is in the air. I will be using 
petroleum jelly to collect airborne particles that are in the atmospehre, 
and analyze the different quantities in certain parts of the city. However, 
this experiment does not allow me to identify the difference in these 
particles. I was wondering if there were ways of detecting 
and differentiating these airborne particles found in the atmosphere. Thank 
you very much for your help.

Wenya

Re: What is a simple way to identify the different air pollutants in the air?