JDSThe picture was taken by a plane passenger as they passed over the burning chemicals from the #ohio train derailment.
Bryn 
@JDS Just wanna point out that many of my friends, family, and colleagues here in Pittsburgh have noticed a lot of air quality issues and allergy irritation in the past couple days
A lot of people are blaming the sudden change in weather, but I'm willing to bet that the consequences of this train wreck just west of us are farther-reaching than a lot of people realize.