NEW DELHI: The Indian capital’s notorious air pollution hit “emergency” levels again Wednesday, coinciding with a visit by Britain’s Prince Charles.

New Delhi has been choked on and off for weeks, as industrial and traffic pollution combined with smoke from crop stubble burning cast a toxic pall over the metropolis.

For the second time in 10 days, the amount of 2.5 PM the deadly tiny particles that get into the bloodstream and lungs hit “emergency” levels, nearly 20 times the safe limit set by the World Health Organisation.

With the government facing new criticism over steps taken to counter the pollution, Prince Charles visited the Indian Meteorology Department as part of his two-day visit to India.

Charles, frequently outspoken on green issues, was briefed on the crisis by Sunita Narain, a leading environmental activist.

She did not reveal details of her royal talks, but in a commentary last week said: “Every breath we take is poison.”

Narain has called for faster moves away from coal and other “dirty fuels” as energy sources and said authorities are doing “too little too late”.