Almonds, like other tree nuts, can be susceptible to aflatoxin contamination, especially if they are grown in regions with a history of aflatoxin contamination or if they are stored in conditions that are conducive to mold growth. Aflatoxigenic molds can grow on almonds if they are exposed to high humidity and warm temperatures, and produce aflatoxins. The U.S. Food and Drug Administration (FDA) has established an action level of 20 ppb for aflatoxins in tree nuts, including almonds. The FDA also has a monitoring program for aflatoxins in almonds and other tree nuts.