Which of the following is NOT an appropriate action if exposed to harmful materials?

Ignoring minor irritation when exposed to harmful materials is not an appropriate action because even slight symptoms can indicate a more serious underlying issue. Harmful materials can have cumulative effects or lead to more severe health problems if not addressed promptly. Taking symptoms lightly can result in prolonged exposure and increased risk of injury or illness, which goes against established safety protocols.

In contrast, utilizing eyewash facilities immediately and seeking medical attention are both proactive measures to mitigate the effects of exposure. These actions ensure that any harmful substances are quickly removed from sensitive areas like the eyes and that a medical professional can assess and treat any potential harm. Monitoring symptoms can also be important in understanding prolonged effects, but it should not replace immediate action in response to exposure.