In many areas of Delhi air quality deteriorated into the "hazardous" category on Sunday with the potential to cause respiratory illnesses.
Authorities have urged people to stay inside to protect themselves.
Mr Kejriwal called on the central government to provide relief and tackle the toxic pollution.
Schools have been closed, more than 30 flights diverted and construction work halted as the city sits in a thick blanket of smog.
Delhi Health Minister Satyendar Jain advised the city's residents to "avoid outdoor physical activities, especially during morning and late evening hours".
The advisory also said people should wear anti-pollution masks, avoid polluted areas and keep doors and windows closed.
How bad is the smog?
Levels of dangerous particles in the air - known as PM2.5 - are far higher than recommended and about seven times higher than in the Chinese capital Beijing.
An Indian health ministry official said the city's pollution monitors did not have enough digits to accurately record pollution levels, which he called a "disaster".
Five million masks were handed out in schools on Friday as officials declared a public health emergency and Mr Kejriwal likened the city to a "gas chamber".
The World Health Organization (WHO) says a third of deaths from stroke, lung cancer and heart disease are due to air pollution.
"This is having an equivalent effect to that of smoking tobacco," the WHO says on its website.
Photo Reuters Caption: Worshippers braved the smog to enter the polluted River Yamuna as part of the Hindu religious festival of Chatth Puja