How did our plants grow?

We have finished the next experiment. We have planted lentil seeds and we have waited until they have germinated. When small plants appeared, we treated them with disolutions of our home pollutants. 

Ten days lated, we had new results. Our lentil plants had grown but we noticed differences between treatments in growth. Here you have some pictures:

When plants were grown we pulled up the plants and we measured stalk lenght, root lenght and we weighed plants. We have compared results with different treatments. And here you have our results. What are your conclusions? Do our pollutants affects plants and environment? Please write our conclusions.