Yes diesel fumes are dangerous. Like gasoline fumes, diesel fumes contain hydrocarbons, which are not very friendly.
In the short term, diesel fumes cause irritation to the eyes, throat, and lungs.
The long-term effects include bronchitis, headache, and as Dr. Mercola suggests, particles from diesel fumes can travel to the brain, interfering with its normal function, and increasing the risks of developing conditions like Parkinson’s and Alzheimer’s disease.