We all know that houseplants are good for us—the process of photosynthesis absorbs carbon dioxide and volatile organic compounds while producing oxygen. Studies also show that greenery lowers stress. But how many plants do you need to make a difference? And what kind? Plant Life Balance is a new app trying to take the guesswork out of the type and number of plants you need to hit the sweet spot of cleaner air and boosted wellbeing.

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