Volatile organic compounds (VOCs) are one of the main pollutants in industrial painting. Monitoring VOCs in painting workplaces is one of the keys to protect the health of operators, reduce environmental pollution, and ensure the safety production of painting industry. The effects of time, wind speed and space position on the concentration distribution of VOCs were studied by mathematical analysis. Results showed that the concentration of VOCs was positively proportional to the spraying time in the spraying process. The concentration of VOCs was significantly reduced by air circulation, and when the air circulation speed was 1.5 m/s, the VOCs concentration decreased by 80.7% compared to that under the windless environment. According to the distribution law of VOCs at different axial and radial distances of the nozzle, the measuring position of the PID gas sensor in the spraying workshop was determined. In the area where the axial distance was 1.6～2.0 m and the radial distance was 0.3～0.4 m, the concentration of VOCs reached a stable value under the windless environment. Therefore, installing the sensor in this area to avoid air circulation as far as possible could achieve better monitoring effect and avoid affecting the normal spraying operation.
