In pictures: Nasa satellite captures toxic smog blanket over Lahore and New Delhi - Indian students give Canada cold shoulder as Ottawa, New Delhi butt heads - India's capital New Delhi shuts all primary schools as air quality worsens - New Delhi closes all primary schools due to soaring smog levels - Nepal PM picks Beijing over New Delhi for maiden visit, urged to bolster economic ties - New Delhi chokes as winter haze thickens - Moscow, New Delhi to work on expanding economic cooperation -- Indian Foreign Ministry - Russian-Indian Business Council, Synergy Corp open representative office in New Delhi - New Delhi supports Moscow's growing interest in India's economic potential -- top diplomat - Moscow, New Delhi to develop trade transport routes -- Indian foreign minister