Fuzzy Math: How Do You Calculate Emissions From a Storage Tank When The Numbers Don’t Add Up?

Amid growing concerns that its fumes may be harming locals, a company that owns petroleum storage tanks in South Portland, Maine, showed drastic cuts in their emissions over the course of a year not by changing its practices, but by altering a key part of its emissions calculation. Reporter Sabrina Shankman looks at the company’s questionable math in the latest installment of this ongoing investigative series.