At 6:25 Tuesday night, activists in Richmond will gather at the city's Civic Center. They will ring a bell 15 times to commemorate the 15,000 Richmond residents who went to the hospital one year ago following the refinery fire.
Activist Andres Soto says the ceremony will have a different tone from Saturday's protest, when more than 200 people were arrested.

"We're really trying to express our sadness about the health and safety of the community and the workers because of the continuing episodic pollution," he said.
In a statement, Chevron said it is committed to making sure something like last August's incident does not happen again.
The commemoration comes a day after Chevron USA Inc. pleaded no contest to six misdemeanor criminal charges in Contra Costa County Superior Court. They agreed to pay nearly $2 million in restitution and fines related to last year's massive fire at its Richmond refinery.The explosion and blaze on Aug. 6, 2012, were caused by a leak from a corroded crude oil distillation pipe, and created a huge plume of polluted black smoke.