Pollution in Singapore, the sanitized city-state best known for its ban against chewing gum and littering, hit historic levels today. Forest burning in nearby Indonesia pushed Singapore’s pollution index to 371 by midday, well above the 300 threshold that health officials say is dangerous to public health. (The previous record was in 1996, at 226.) Officials warned Singaporeans to stay indoors. In Malaysia, 200 schools were closed. Singapore’s prime minister Lee Hsien Loong said the smog could last for weeks.