Fans play a core role in air purification and pollution control in the field of environmental protection, serving as key equipment in critical areas such as air pollution prevention and control, industrial waste gas treatment, and environmental remediation. In industrial flue gas treatment systems, high-flow, high-pressure centrifugal fans drive dust-laden exhaust gases through SCR denitrification towers and wet desulfurization towers. Their acid-resistant titanium alloy impellers can withstand highly corrosive media with a pH value of 2 to 5. Coupled with an intelligent speed control system, the flue gas residence time is precisely controlled within the optimal reaction range of 3 to 5 seconds. In the field of VOCs treatment, explosion-proof RTO fans are equipped with precise flow distribution valves to homogenize the concentration of exhaust gases. The three-chamber regenerative design boosts thermal efficiency to over 95%, and the decomposition rate of organic exhaust gases exceeds 99%. Urban sewage treatment plants' biological deodorization systems are equipped with fiberglass-reinforced plastic (FRP) anti-corrosion fans, using a combination of water curtain pretreatment and biological filters. The removal efficiency of hydrogen sulfide reaches 98%, and the operating noise is below 75 decibels. In soil remediation projects, gas extraction fans feature a dual-stage filtration design, capable of continuously treating chlorinated hydrocarbon-contaminated gases. Their variable frequency control systems automatically adjust the extraction negative pressure based on changes in groundwater levels. Smart environmental monitoring stations integrate miniature silent fans, ensuring the accuracy of PM2.5 monitoring data through constant-flow sampling technology. IoT modules upload the operational status of the equipment in real time. With the development of carbon neutrality, the new generation of environmental protection fans integrates carbon capture technology, achieving a 40% increase in CO2 enrichment efficiency in the treatment of blast furnace gas in steel mills. The application of magnetic levitation bearings in sewage treatment aeration fans saves 35% in energy. In the future, environmental protection governance will deeply integrate digital twin technology, optimizing the process parameters of exhaust gas treatment through simulation and modeling. AI-driven intelligent fan systems can automatically match the best operating mode based on the characteristics of pollution sources, providing more efficient and intelligent technical equipment support for the battle to protect blue skies, clear waters, and clean lands, and demonstrating greater value in addressing climate change and emerging pollutant control.