Working conditions and the effect of ventilation in automobile repair shops

The aim of this study was to quantify VOC concentrations in different ventilation conditions, Wet Bulb Globe Temperature (WBGT), illumination and noise levels in two automobile repair shops. A cross-sectional study was conducted at two shops in Surat Thani province, Thailand. VOCs were collected by area sampling using charcoal tubes. The air samples were analyzed by GC-FID. The noise levels, illumination, and temperature were measured by using noise dosimeter, lux meter, and WBGT apparatus, respectively. Fifteen different VOCs were detected in both shops. Most of the VOCs measured had levels below the limit values suggested by ACGIH, except toluene and chloroform in shop B. The average VOCs concentrations in shop B after installation of local exhaust ventilation and opening the door for 30 minutes after finishing painting a car, was significantly lower than before and after installation of the local exhaust ventilation. The WBGT indoors varied within 26° to 31°C, TWA noise levels were within 63 to 90 dBA, and illuminations were within 250 to 988 lux. Sheet metal work task in shop A had noise levels exceeding the standard. Proper ventilation and using respirators during operator work are essential in eliminating health hazards of automobile mechanics. Hearing conservation program could prevent hearing losses.