These cylinders should be checked for an oxygen level of 19 to 23 percent by volume.
Preliminary tests show a low level of oxygen in the cylinders.
The cylinders were filled by Aeriform. Aeriform shipped the class D breathing air cylinders to companies in the Houston, Port Arthur, Beaumont and Corpus Christi areas. Records cannot confirm the names of the companies and what cylinders they received. The air cylinders may not contain a sufficient amount of oxygen and could be hazardous. Previously, the cylinders were thought to be part of a certain lot number, however, the lot numbers cannot be confirmed as accurate.