Air Quality and Noise Detection in the Parking Area of Sahathai Plaza, Nakhon Si Thammarat Province

Abstract

This study aimed to explore the air quality and noise level measurements in the parking area of Sahathai Plaza, Nakhon Si Thammarat Province. The results showed that relative humidity had the highest average value of 74.7%, which was found to be higher than the standard set by the Department of Health (between 50 - 65%). The average maximum temperature was determined to be 30.6 degrees Celsius, which is higher than the Department of Health's recommended range of 20 to 26 degrees Celsius. The average maximum wind current was 0.1 m/s which was found to be value within the standard set by the Department of Health (between 0.1 - 0.3 meters per second). The highest average oxygen concentration was 11.1%, it was found to be lower than the standard set by the Ministry of Labor (between 19.5 - 23.5%). The concentration of carbon monoxide gas had the highest average of 21.9 ppm, which was found to be higher than the standard set by the Department of Health (not more than 9 ppm), on an average concentration in 8 hours, The concentration of carbon dioxide had the highest average of 673.1 ppm, which was found to be lower than the standard set by the Department of Health (not exceeding 1,000 ppm) and sulfur dioxide concentration the highest average value was 0.0 ppm, which was found to be value within the criteria set by the Pollution Control Department (not more than 0.3 ppm). As for the noise level, the highest average was 72.1 decibels A, which was found to be higher than the standard set by the Pollution Control Department (not exceeding 70 decibels A), averaging the 24-hour noise level. Wearing ears protection, such as earplugs or earmuffs was needed to reduce exposure to loud noises in the work area all the time.