INEOS Styrolution was experiencing high flaring Wednesday, due to a unit upset.
The Aamjiwnaang Notification System reported just before 10 a.m. that a Chemical Valley Emergency Coordinating Organization Information Notice was been issued.
The company said noise and steam venting could be expected.
TransAlta also issued an information notice Wednesday morning, just after 11 a.m., for loud noise, due to a unit upset.