<p>PM2.5 has gained wide public awareness amongst Thais for nearly a decade. Many probably have questioned how much longer we need to live with the health crisis brought on by the annual recurrent problem of ultra-fine dust particles which the World Health Organization (WHO) claimed causes 4.2 million premature deaths worldwide each year. &nbsp;</p>

<p>In Thailand, efforts to control Aedes mosquitoes and dengue fever have produced uneven results.&nbsp;Over the past few decades, the toll of the disease has diminished in some areas. In others, mosquito-borne infections remain high. To improve the situation, control measures are being reconsidered.</p>

<p><span><span><span><span><span><span><span>The rainy season comes and goes, leaving behind hundreds of thousands dengue fever patients. Each year, hundreds die of the disease. The recurring outbreak was bad enough before. Now mosquitoes have developed improved resistance to control measures, creating a new challenge for public health officials.</span></span></span></span></span></span></span></p>