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BACKGROUND: concentrations below the 2021 Guideline level of 15 µg/m³. Additionally, the province is periodically affected by seasonal transboundary haze from forest fires. METHODS: concentrations were estimated through inverse distance weighted interpolation. Conditional logistic regression, incorporating time-lagged models and cubic splines, was applied. RESULTS: concentrations of 15-25 µg/m³. CONCLUSION: .
Varopichetsan et al. (Wed,) studied this question.