Pollution in Delhi has caused the government to take swift action, closing schools, canceling trains, delaying flights and halting construction projects.
CNN reports that a thick, white haze began to settle of the India capitol on Tuesday and quickly got worse.
Air quality readings revealed a frightening statistic: At one point topping the 1,000 mark on the US embassy air quality index (for reference, the World Health Organization considers anything over 25 to be unsafe).
That mark is based on the concentration of fine particulate matter, or PM2.5, per cubic meter.
According to the independent Berkeley Earth science research group, breathing in air with a PM2.
5 content of between 950 to 1,000 is considered roughly equivalent to smoking 44 cigarettes a day..