NEW DELHI, India (Reuters) — Delhi residents woke up to a bright morning and improved visibility on Saturday (November 18) after an overnight drizzle marginally improved the smog levels in the city. However, the levels of poisonous air borne particles, known as PM 2.5, remained “very unhealthy”. According to a U.S. embassy measure, the level of PM 2.5 stood at 256 at 11 am (0530GMT) – five times the upper limit of “good” quality air […]