Associated Press: Instrument-laden aircraft and a research ship equipped to sniff the atmosphere and ocean have joined land-based monitoring stations in a huge field study of air pollution and climate change in California. The goal of the $20 million state and federal project is to understand the origin of pollutants and greenhouse gases, where they go and what becomes of them as an integrated air-quality and climate-change issue. “Many chemicals that change climate are also air pollutants and …