As global climate change intensifies, carbon emission reduction has become a central issue for countries worldwide, with carbon markets playing a key role in addressing this challenge. Through a detailed examination of the EU’s carbon tax mechanism and related carbon emission monitoring systems, this paper provides insights into the EU's pioneering role in carbon reduction strategies. The EU has implemented significant measures, including the Carbon Border Adjustment Mechanism (CBAM), to promote carbon reduction while ensuring fair trade practices. Accurate carbon emission measurement is critical to the functioning of carbon markets, ensuring transparency and fairness. The EU has established a robust carbon emission monitoring system based on internationally recognized standards. Emerging technologies, such as AI, IoT, and blockchain, offer strong support for improving carbon measurement systems, driving carbon market efficiency. Developing countries should invest in advanced carbon measurement technologies, aiming to improve emission data reliability and meet international standards, thereby enhancing their competitiveness in the global carbon market.