For months, the air over West Kalimantan has been thick enough to taste. Now, some of the province’s residents are taking the government to court over it. Indonesia’s worst wildfire season in 11 years has been sending plumes of toxic haze drifting across borders to Malaysia, Singapore and the Philippines since at least August. But nowhere has been worse hit than West Kalimantan, where more than 48,000 hectares (185 square miles) of land and forest have burned since the start of the year,...