Additives included in fuels to render them more environmentally friendly. In most countries fuel quality standards have been enacted to help protect public health and the environment from harmful gas and particulate matter emissions from motor vehicles and engines. These standards have included over the years the gradual phase down of lead to reduce the health risks from lead emissions from gasoline; then requiring gasoline to meet volatility standards to decrease evaporative emissions of gasoline; the reduction of emissions of carbon monoxide and the reformulated gasoline program which is designed to reduce emissions of smog-forming and toxic pollutants. Standards have also been set requiring gasoline to be treated with detergents and deposit control additives and standards for low sulfur gasoline and low sulfur diesel, which will help ensure the effectiveness of low emission-control technologies in vehicles and reduce harmful air pollution.