Industrial exhaust carries abundant recyclable airflow energy, yet its complex, highly fluctuating and unstable characteristics hinder efficient harvesting. Here, we present a Venturi-induced triboelectric nanogenerator (VI-TENG), which leverages the pressure gradient generated by the Venturi effect to achieve high-efficiency conversion of airflow energy into electricity. It is important that the rolling contact design of VI-TENG achieves an ultralow starting torque of 0.7 N·cm, enabling start-up at 1.1 m s−1 and delivers a high average power density of 11.16 W m−3. Remarkably, it maintains stable output across a range of temperature and humidity conditions and retains 95.1% of its initial performance after more than 50 000 cycles. Furthermore, develop an in situ self-power hygrothermograph, anemometer and carbon monoxide environment monitoring system. This design offers a practical route to expand industrial exhaust energy harvesting and in situ self-powered environment monitoring.