By Sakshi Dayal NEW DELHI (Reuters) -Toxic smog obscured India's famed monument to love, the Taj Mahal, as well as Sikhism's holiest shrine, the Golden Temple in Amritsar, and delayed flights on Thursday,

India’s government banned non-essential construction in New Delhi, the world’s most polluted capital, and urged residents to avoid burning coal for heating, to combat worsening air quality that has disrupted flights and obscured the Taj Mahal.

Pakistan's Lahore remained the world's most polluted city, while visibility in parts of northern India fell to zero. Seasonal crop burning, low winds, and dropping temperatures contribute to toxic smog in these regions.

India's government banned non-essential construction in New Delhi, the world's most polluted capital, and urged residents to avoid burning coal for heating, to combat worsening air quality that has disrupted flights and obscured the Taj Mahal.

Residents of India's capital New Delhi choked in a blanketing toxic smog Wednesday as worsening air pollution surged past 50 times the World Health Organization's recommended daily maximum.That is more than 53 times the World Health Organization recommended daily maximum of fine particulate matter -- dangerous cancer-causing microparticles known as PM2.

Toxic smog obscured India’s famed monument to love, the Taj Mahal, as well as Sikhism’s holiest shrine, the Golden Temple in Amritsar, and delayed flights on Thursday, becoming too thick to see through in several places.

Toxic smog blanketed northern India on Thursday, becoming too thick to see through in several places, as high levels of pollution combined with humidity, low wind speed, and a drop in temperature, officials said.

A dense smog blanketed the Taj Mahal in Agra on Thursday as pollution levels surged, obscuring the iconic monument from view. Tourists captured visuals showing the Taj Mahal nearly invisible behind the haze.