Which type of fossil fuels are the most dangerous to burn?

Coal is often considered the most dangerous fossil fuel to burn due to its high carbon content and significant emissions of harmful pollutants, including sulfur dioxide, nitrogen oxides, and particulate matter. These emissions contribute to air pollution, respiratory diseases, and climate change. Additionally, coal mining poses severe environmental and health risks. While oil and natural gas also have environmental impacts, coal's extensive use and toxic byproducts make it particularly hazardous.