6/2/15 Los Angeles Daily News
Air pollution was at dangerous levels, environmental authorities said. People were advised to stay indoors as much as possible and avoid exercise. Asthma sufferers should take particular care.
On the city streets, this pollution could be seen in dirty clouds hanging amid grid-locked traffic.
The “environmental pre-contingency” on May 9 was the fourth so far this year, compared to three in all of 2014. The warnings are a reminder of the long uphill battle against dirty air in North America’s largest city — which has been a laboratory for pollution in megacities around the planet.