Summary | Four-tier alerts--blue, yellow, orange and red--will
be issued on "heavy pollution" days.An air quality index of
over 200 is defined as "heavy pollution".Drivers with odd and
even license plates will be allowed on alternating days during
red alerts.Construction will be shut down.In 2014, Beijing
issued blue alert 11 times, yellow alert five times, and orange ...
be issued on "heavy pollution" days.An air quality index of
over 200 is defined as "heavy pollution".Drivers with odd and
even license plates will be allowed on alternating days during
red alerts.Construction will be shut down.In 2014, Beijing
issued blue alert 11 times, yellow alert five times, and orange ...
en.ce.cn | 30 March 2015