"The Sierra Club launched a system Tuesday to send text message alerts when smog pollution is at a high level in certain areas.

The group said the system is meant to protect people from asthma attacks, which scientists believe increase in frequency in response to smog, whose main component is ground-level ozone.

But the alerts are also meant to spur users to encourage the Environmental Protection Agency (EPA) to cut the allowable level of ozone pollution."

Timothy Cama reports for The Hill May 5, 2015. [2]

SEE ALSO:

"Free Air Quality Alerts Available as Summer Smog Season Starts Soon" (EPA Release) [3]