Why the air quality in Philly might be worse than we know

The federal agency claims Philadelphia Energy Solutions failed to properly monitor a burst pipe that started the fire. The bankrupt former operator hasn’t admitted fault.

Officials and business executives broke ground on the industrial and logistics campus at the former refinery site this week.

Philly’s air monitors did not detect a rise in unhealthy particulate pollution during Wednesday’s fire, officials say, but the closest monitor is two miles away.