Yes, Mars does have oxygen, but only in extremely small amounts, making its atmosphere unbreathable for humans.
Understanding Mars's Atmosphere
Mars possesses an atmosphere, but it is remarkably thin compared to Earth's, being approximately 100 times less dense. The composition of the Martian atmosphere is primarily carbon dioxide. While oxygen is indeed present, its concentration is very low, far from sufficient to support human respiration.
Implications for Human Exploration
Due to the scarcity of oxygen and the dominance of carbon dioxide, the Martian air cannot sustain human life. Any astronaut venturing onto the Martian surface would require a specialized spacesuit equipped with its own independent oxygen supply to breathe safely and operate outdoors. This necessity highlights the significant environmental differences between Earth and Mars, particularly concerning breathable air.
