Planting Healthy Air
In 2017, TNC published a new study, Planting Healthy Air, showing that an annual global investment of HK$11 per person in planting urban trees could provide 68 million people with measurable reductions in particulate matter pollution and 77 million people with cooler cities.
Every year, more than three million people die from the effects of fine particulate matter — air pollution so small that it enters the bloodstream and lungs, causing asthma, heart disease and stroke. Simple though tree planting may be, this sort of minimal investment could make our planet a much healthier place for tens of millions, including:
Urban heat poses a deadly threat to millions around the globe — in fact, it’s the deadliest type of weather-related disaster. Trees can cool their immediate vicinity by as much as two degrees Celsius.
Particulate matter pollution: Trees can remove as much as one-quarter of the particulate matter pollution within a few hundred yards, and, when planted in the right places, can offer an effective barrier, filtering bad air and protecting local residents.