A toxic haze shrouds India's capital and residents are being warned to wear masks. Schools were ordered closed for three days. New Delhi generally has its fair share of pollution problems due to the nine million vehicles that clog its streets, most not conforming to emissions standards. The situation has been made worse recently due to a number of factors. These include chemical pollution blowing in from nearby states, farmers setting fire to straw as autumn arrives, and a lack of wind. To alleviate the crisis, city officials have ordered roads to be doused with water to stop dust from rising. They have also banned diesel-powered electricity generators for 10 days, except at hospitals and cellphone towers.