(Feb.18, 2015) As urban residents know, air quality is a big deal. When local
pollution levels go up, the associated health risks also increase, especially
for children and seniors. But air pollution varies widely over the course of a
day and by location, even within the same city. Now scientists, reporting in
the ACS journal Environmental Science & Technology, have used smartphone
and sensing technology to better pinpoint where and when pollution is at its
worst.