Secondhand smoke point-source exposures assessed by particulate matter at two popular public beaches in Thailand.

Background: Throughout Asia, smoking is commonplace at crowded public beaches. Evidence has clearly shown the dangers of secondhand smoke (SHS) indoors, but no naturalistic studies have determined levels of SHS in outdoor air. Methods: We measured SHS exposure at two public beaches in Thailand where families lounge in beach chairs under beach umbrellas. Researchers unobtrusively collected PM2.5 in close proximity to smokers by placing instruments downwind from smokers. We collected 88 samples of second-by-second measurements over 10-min periods. The density of people, smokers and children in each sampling area was also recorded. Results: At the two beaches, mean levels were 260 and 504 µg/m3; peak levels reaching up to 716 and 1335 µg/m3. Five of the 88 samples were below the outdoor standard for Thailand of 50 µg/m3. Density counts in sampled zones were up to 4 smokers and 15 children under 12 years of age. Findings show high beach exposures suggesting regulatory protections, especially for children whose exposures can produce multiple health consequences. Conclusions: Action should be taken to prohibit smoking on Thai beaches as in other outdoor settings because peak levels of PM2.5 almost always exceeded the outdoor standard in Thailand and pose a danger to health.

Determining the burden of secondhand smoke exposure on the respiratory health of Thai children.

BACKGROUND: The impact of secondhand smoke (SHS) on Southeast Asian children's health has been assessed by a limited number of studies. The purpose of this study was to determine whether in Thailand, pre- and postnatal exposure to SHS is associated with acute lower respiratory conditions in young children. METHODS: We conducted a case control study of 462 children under age five admitted with acute lower respiratory illnesses, including asthma and pneumonia, at a major hospital in Bangkok. We selected 462 comparison controls from the well-child clinic at the hospital and matched them by sex and age. We used a structured questionnaire to collect information about exposure to SHS and other factors. We conducted bivariate and multivariate analyses to identify risk factors for acute lower respiratory conditions. RESULTS: The number of cigarettes smoked at home per day by household members was significantly greater among cases. A greater number of household caregivers of cases held and carried children while smoking as compared to controls (26% versus 7%, p <0.05). Cases were more likely to have been exposed to SHS in the household (adjusted OR = 3.82, 95% CI = 2.47-5.9), and outside (adjusted OR = 2.99, 95% CI = 1.45-6.15). Parental lower educational level and low household income were also associated with respiratory illnesses in Thai children under five. CONCLUSIONS: Thai children who are exposed to SHS are at nearly 4 times greater risk of developing acute lower respiratory conditions. Continued effort is needed in Thailand to eliminate children's exposure to SHS, especially at home.