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Fig. 1 | Environmental Health

Fig. 1

From: Short-term exposure to fine particulate matter and asthma exacerbation: a large population-based case-crossover study in Southern Thailand

Fig. 1

Geographical location of Songkhla districts and environmental monitoring stations across southern Thailand

Asterisks indicate district centroids, and triangles mark the locations of monitoring stations for PM2.5, temperature, and relative humidity in Songkhla and neighboring provinces. The inset map highlights the location of Songkhla province within Thailand. Population density across districts is depicted using a shaded color gradient

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Environmental Health

ISSN: 1476-069X