From Environmental Services website:
Polystyrene foam products are typically used one time before being discarded, and due to their light weight can easily become litter. Polystyrene foam litter breaks down into small pieces which do not biodegrade and often end up in streets, canyons, waterways, storm drains, and eventually the ocean, where it harms wildlife that mistakenly ingests it.
Plastic straws are a significant contributor to marine pollution and are among the most common forms of litter collected on California beaches. They are not accepted in local recycling programs.
The Single Use Plastic Reduction Ordinance will help San Diego reach its Zero Waste goals and help maintain clean and beautiful beaches and public spaces. The Ordinance will also meet the objectives of the City’s Climate Action Plan.