Image of the Day for April 23, 2026 Seasonal fires have darkened skies over Southeast Asia. Apr 23, 2026 View more Images of the Day: Chiang Mai , Thailand’s second-largest city, lies within a network of narrow valleys in the country's northern highlands. Though the historic city is known for panoramic views of the surrounding mountains, clear skies have become less common . In recent decades, smoke has increasingly darkened the skies during the dry season, particularly in March and April. A NASA satellite captured this smoky view of the city and the surrounding region on April 22, 2026, when haze partially obscured valleys and ridges typically visible under clearer conditions. Most of the smoke likely comes from small agricultural and forest fires lit to burn off crop debris or maintain forest ecosystems. In 2026, satellite sensors detected small numbers of fires throughout January, but fire detections became more numerous and widespread in February, March, and April.…