The Los Angeles and Long Beach seaports experienced unprecedented spikes in air emissions in 2021, according to newly released air emissions inventories released by the ports Oct. 6. Both seaports attributed the emissions increase to supply chain bottlenecks brought on by pandemic-driven cargo volumes, resulting in cargo ships waiting at anchor. In Los Angeles, diesel particulate matter rose 56% in 2021, while nitrogen oxides and sulfur oxides surged by 54% and 145%, respectively, data show. “The environmental impact of a congested supply chain was evident last year,” Port of Los Angeles Executive Director Gene Seroka remarked. “The backlog of ships…