California ICC UST Service Technician Practice Exam

Which of the following is the most toxic?

1. Diesel

2. Kerosene

3. Jet fuel

4. Gasoline

The correct answer is: Gasoline

Gasoline is considered the most toxic among the options provided due to its chemical composition and the presence of various harmful compounds. It contains a mixture of hydrocarbons that can include benzene, toluene, ethyl benzene, and xylene (often referred to collectively as BTEX). Benzene, in particular, is a well-known carcinogen that poses significant health risks upon exposure. Furthermore, the volatility of gasoline contributes to its toxicity, as it can rapidly evaporate and produce harmful vapors. These vapors are not only flammable but can also lead to severe respiratory issues and other health problems when inhaled. While diesel, kerosene, and jet fuel all have their own toxic characteristics, they are generally less toxic compared to gasoline. Diesel, for instance, typically contains larger hydrocarbons and produces less vapor than gasoline, leading to a lower immediate toxicity risk upon exposure. Kerosene and jet fuel also have lower volatility and toxicity levels compared to gasoline, making gasoline stand out as the most hazardous option in terms of acute exposure risks and long-term health effects.