<qa>  What is the largest oil refinery in the Haifa Bay Area?The Haifa Bay Area has a long history of industrialization including possessing the nations largest oil refineries, oil-fired power plant, agrochemical and cement producers, industrial incinerators and the Eastern Mediterraneans busiest port. The presence of industrial and mobile sources, combined with a basin effect has contributed to air pollution in the Haifa Bay Area and has raised concerns about potential health effects. 