When you should seek medical attention from symptoms of carbon monoxide poisoning from diesel exhaust fumes?

You should seek medical attention if you experience symptoms of carbon monoxide poisoning, such as headache, dizziness, confusion, shortness of breath, or nausea, especially if you have been exposed to diesel exhaust fumes in an enclosed or poorly ventilated space. Prompt treatment is crucial, as carbon monoxide can lead to serious health complications or even be life-threatening. If symptoms are severe or worsening, it's important to call emergency services immediately. Always err on the side of caution with potential carbon monoxide exposure.