I want to find a way to collect oxygen from algae to release more oxygen to environment and capture more carbon dioxide from environment to have lower pollution in the cities and urban areas .
as you know, pollutants in big cities can cause different illnesses and it is essential to prevent this. so i choose algae for that because it has a lot of applications to clean the air.
The algae have no big benefit because the size that why the researchers recommended the tree or plant have big leaves
Carbon dioxide isn't a pollutant, and converting it to oxygen won't change any concentrations in general on a small scale. It is also no point collecting any oxygen for release, since algae or other plants will release it to the atmosphere anyway.
If you are interested in making a difference on the environment using plants you could always grow aquatic plants that utilize nitrogen-fixating bacteria or similar to create fertilizer. Another alternative is to maintain quickly-growing aquatic plants that can be turned into bio-fuel or similar.