In this photo by Joshua Paul, a construction worker lights a cigarette against the hazy skyline in Kuala Lumpur, Malaysia. Wildfires caused by illegal land clearing on Indonesia's Sumatra and Borneo islands often spread choking haze into neighboring countries, and several locations in western Malaysia registered unhealthy air quality Thursday. Last year, the Indonesian Parliament ratified an agreement with other Southeast Asian countries to more actively fight forest fires and haze. The country banned open burning in 1999 after the haze caused disputes with its neighbors, but enforcement is often lax.