Air quality monitors mounted on public transit see pollution other sensors miss
Researchers in Salt Lake City are using light rail trains to measure the city's air pollution
Ozone in the air is bad for birds
Regulations addressing air pollution have prevented the deaths of 1.5 billion birds over the past 40 years
A version of this article originally appeared on Science Friday
The ground is softening. Something is shifting in Antarctica's McMurdo Dry Valleys
The first water measurements here were taken in 1903. Long-term monitoring since then tells the tale of an abrupt ecosystem shift