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In the context of the 23rd United Nations Conference on Climate Change, COP23 officially opened on 6 November in the Bonn city, Germany, many countries are still in the haze and air pollution.Specifically, yesterday on November 7^th, a fog covered in New Delhi city, India, where air pollution hit extremely dangerous level.

New Delhi's measured air quality index reached 451 on the 500 scale. This is extremely serious level because the value over 100 has been considered to adversely affect health. Doctors in the medical association in India have declared a state of emergency in New Delhi capital, advising people not to go out.

Indian medical association claims New Delhi is in a state of emergency on public health, schools need to close the door, people should not go out of the home, especially the elderly, pregnant women, children and people with heart disease and asthma. We have sent a notice to the ministry of education so the schools close the fastest.

The dense dust is not only affect to human health but also delay the aviation and rail activities. According the reports, there are 20 flights delayed and more than dozens of train are late because of reduced visibility. At the serious level, even healthy people are effected and the sick people also affected seriously. In the city, the dense fog more worse, the citizens complained because of their eye pain and sore throat status. According to AP, when India weather get colder in the winter, the poor people will burn coal, plants and trash for warning. This cause the dense clouds of smoke covered the city. According to the forecast, the fog are going to continue in 3 days. Therefore, the authorities announced to the states of Northern of India. In addition, emissions from the factories also cause fog. Over the past 2 years, New Delhi is considered the most polluted city in the word.