In recent weeks, Singaporean Cindy has been troubled by an odour lingering in the air during her evening walks to the gym.“It’s the same situation every year, but I would say that the fogginess and burning smell have been getting stronger for the last year or so,” said the 33-year-old resident who lives in the southern estate of Telok Blangah.“I have a baby, so it concerns me a lot, and I know many other families feel the same,” she said. “I always keep our windows closed, which is not very...