1042 GMT March 22, 2018
The new study included 196 inner-city children in Baltimore, aged three to 12 years, with persistent asthma, UPI wrote.
Some lived close to a park or other green space, while others were more than 0.6 miles away from one.
The farther the children lived from a park, the more asthma symptoms they had over a two-week period, the study found.
For every 1,000 feet between their home and a park, children had symptoms one extra day.
Kids who lived next to a park averaged five days with symptoms over two weeks.
A child who lived 1,000 feet from the park averaged six days with symptoms, according to the study scheduled to be presented September 11 at a European Respiratory Society meeting in Milan, Italy.
Study author Kelli DePriest said, "Living in a city environment increases the risk of childhood asthma, and factors associated with city-living — such as air pollution — are also known to contribute to high rates of poorly controlled asthma.
“Other studies have suggested that children with asthma benefit from exercise, and the presence of green spaces promotes physical activity and helps lower pollution.
“The effect appears greatest for kids who are six years and older.” DePriest said that's probably because they are freer to roam than younger kids.
The results underscore the benefits of city parks, she said, and suggested that the right building policies can benefit children's health.
DePriest is a public health nurse who did the study as part of a doctoral program at Johns Hopkins University School of Nursing and Medicine and the University of Maryland.
Research presented at meetings should be considered preliminary until published in a peer-reviewed journal.