Tariffs are used to reduce the    of goods which do not reach health and safety   .

Tariffs are essentially taxes imposed by a government on imported goods. They are used to protect domestic industries and consumers by making foreign products more expensive. In the context of goods that do not meet health and safety standards, tariffs can serve as a tool to deter the importation of such goods. By increasing the cost of these substandard products, these tariffs incentivize importers to comply with local regulations or face financial losses.

The specific term you might be looking for is "standards" or "regulations." Tariffs can help reduce the "supply" of goods that do not meet health and safety "standards." This is particularly important in industries such as food, pharmaceuticals, and consumer appliances, where safety is paramount.

In summary, tariffs function as a protective measure to ensure that only goods that comply with national health and safety standards enter the market, thus safeguarding public health and welfare.