Today over half of the world's 500 million cars carry a catalyst, and more than 80 % of new cars sold worldwide are fitted with a catalytic converter as standard equipment. Many countries have developed favourable tax rates on vehicles with catalytic converters (and unleaded gasoline). There are also preferential rates for cars with catalytic converters in the annual vehicle tax payment systems.

Pollutant Box

Catalytic converters help reduce emissions of the following pollutants:

Carbon Monoxide (CO) is a poisonous gas that displaces oxygen from the blood. At high concentrations it is fatal; at lower concentrations, it can exacerbate heart problems.

Nitrogen Oxides (NOx) react with hydrocarbons (HC) in sunlight to form ozone and photochemical smog. NOx can increase respiratory illnesses and is a contributor to acid rain. Ozone causes breathing difficulties and damages plants.

Hydrocarbons or Volatile Organic Compounds (HCs or VOCs) can cause respiratory problems and problems with the central nervous system; eye, nose and throat irritations. Many VOCs can cause serious effects such as cancer.

Particulates are found in the air in a range of sizes. Diesel engines are responsible for the majority of ultra-fine particulates (less than one micron in diameter or PM1). Fine particulates are suspected to be linked to increased rates of heart disease, cancer and premature death.