emergency reference level

例句：

1. 1. The emergency reference level for this substance is 50 ppm.
   这种物质的紧急参考水平是50ppm。
2. 2.The safety data sheet for this product lists the emergency reference level as 100 ppm.
   该产品的安全数据表将紧急参考水平列为100ppm。
3. 3. The manufacturer has set the emergency reference level at 150 ppm to ensure safe handling of the product.
   制造商已将紧急参考水平设定为150ppm，以确保产品安全处理。