The goal of this observational study is to determine the prevalence of asthma and chronic obstructive pulmonary disease (COPD) among workers in an industrial zone in Thailand. The main question the study aims to answer is: What is the prevalence of asthma and COPD among workers in Thailand? Participants will complete a questionnaire on respiratory symptoms and undergo pulmonary function testing.
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Prevalence of asthma among workers at the Navanakorn Industrial Zone
Timeframe: Baseline
Prevalence of COPD among workers in the Navanakorn Industrial Zone
Timeframe: Baseline