The solution will be a mix of approaches, none of them in isolation doing the whole job.
> For outdoor air pollution, planting trees can actually increase it
Only if by doing so you remove vegetation to plant them.
That is not correct. Read the article I linked that explains it. Biology isn't as simple as "CO2 => biomass".
In fact most of the article seems to agree that planting trees is a net good for removing CO2 and that the biggest problem is finding enough room to plant all the trees that are needed.
I'd have to disagree. Stopping the production is important, but that doesn't solve the problem, it just doesn't make it worse. A true fix would always include removing some CO2 from the atmosphere, however that may be done.
Normal tree life cycle is capture some co2, die, rot and release it all back into the air.
Multiple approaches are needed, but it's far cheaper and easier to avoid CO2 production than to sequester carbon (even if plants are used to capture it).
It's the best way _to not make it worse_. Carbon Capture doesn't save us from making it worse. It can however undo parts of the damage.
The solution isn't to just freeze the status quo, that's what I'm saying.
This thread is about indoor air pollution. Trees aren't going to help with that. The best way to reduce it is to open a window.
For outdoor air pollution, planting trees can actually increase it[1]. Even in ideal conditions, planting trees is not nearly enough to stop climate change. The best way to fix the CO2 problem is stop producing it, not to try to clean it up.
1. https://www.bbc.com/future/article/20200521-planting-trees-d...