Greenpeace went into the field two weeks ago to investigate how the haze wave was affecting communities in Sumatra and to get an insight into how the forest fires had turned people's lives upside down. "If the haze reached 400 PSI, it is already considered dangerous to human health. last week, on the 25th June, we measured it reached 900 PSI!" said Dr. Syaiful, the director of Dumai General Hospital.