Is there a way to trap air?
If not possible, how can I simply create air pollutants and how can i expose them to invertebrates in a controlled experiment.
Im trying to see the effects of pollution on hydra.
I really need help, please help me 
tell me if you dont understand what im asking.
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Trapping air is not that hard. Just open a jar in the air that you want to take a sample of and close it again. Maybe shake it a bit after your open it to make sure whatever air that was in there when you opened it gets replaced by the sample air. Then you’ll have your sample.
idk
You’ll need to be very careful with hydrogen sulfide as it doesn’t take very much to kill. In general, gas detection kits involve glass straws packed with a chemical that changes color when reacting to a specific chemical and a large syringe used to draw a known volume of air through that glass straw, the amount of chemical that changes color determines how much of the suspect chemical is in the air.
Nitrogen oxides such as Nitrogen dioxide are created under high temperatures and heat such as those experienced in high compression engines like Hemi’s and Diesel engines. Hydrogen Sulfide is that rotten egg smell, anaerobic sulfur based bacteria produces hydrogen sulfide. So decomposing material in an environment deprived of oxygen would have hydrogen sulfide.
Carbon monoxide will probably be the easiest to get, incomplete combustion produces a mixture of hydrogen and carbon monoxide gases, it’s basically that wisp of smoke rising from a candle after the candle has been snuffed out. You can make a simple gasifier to produce such gases. The mixture of carbon monoxide and hydrogen is what we used to light street lights back before natural gas was available and is what’s called town gas, wood gas, coal gas, and syngas
Hydra lives in water so you would have the issue of trying to dissolve the gas into the water by perhaps bubbling it through the water. You may wish to just observe Hydra’s reaction to the acidification of water, then you would only need to get CO2 into the water and not CO. Acidification will be the most likely effect of air pollution on water and CO2 is easy to get or make, there’s dry ice at the grocery store and there’s the old baking soda and vinegar reaction to make CO2. You can also get CO2 by growing some yeast. Acidification can be measured with litmus paper which could be made by boiling red cabbage, your science teacher could probably get you some litmus paper too.
Breathe–that ought to do it.