One of the main points of the NYTimes is the air pollution. Mike tells the rest of the story.
The article then goes on to talk about the permitting for the Diesel generators. Through the admission of the Department of Ecology’s own statement, “At the time, we were in scramble mode to permit our first one of these data centers.” Additionally it also states that:
Although emissions containing diesel particulates are an environmental threat, they were was not yet classified as toxic pollutants in Washington. The original permit did not impose stringent limits, allowing Microsoft to operate its generators for a combined total of more than 6,000 hours a year for “emergency backup electrical power” or unspecified “maintenance purposes.”