What is the main component of Mars' atmosphere?

Mars' atmosphere is composed predominantly of carbon dioxide, making it the primary component. This gas constitutes about 95% of the Martian atmosphere, which significantly differentiates it from Earth's atmosphere, primarily composed of nitrogen and oxygen. The high carbon dioxide levels contribute to the thinness of Mars' atmosphere, which is less than 1% of Earth's pressure at sea level. This thin atmosphere has implications for temperature regulation, weather systems, and the potential for sustaining life. Understanding this composition is crucial in studying the planet's climate, surface conditions, and the potential for past or present life.