Pollution climbed to up to 35 times World Health Organisation safety levels on the third day of the city's "orange alert" - the second highest level.
Factories have been told to cut production and heavy duty trucks ordered off the roads.
It comes as President Xi Jinping attends the Paris climate conference.
Coal, used to power both Chinese factories and heat homes, is a major factor behind the smog, which has been exacerbated by humidity and a lack of wind.
A particularly cold November has meant a surge in coal burning, both in individuals' homes and by power plants. Most of China's power is coal-generated.
"The government is supposed to be tackling the pollution, so we need to see the effects. If in a few years the situation does not change, we will consider leaving," the Associated Press news agency quoted Yin Lina, a woman who had bought her young daughter to hospital, as saying.
A measure of pollution called PM2.5 - concentrations of airborne particles smaller than 2.5 microns in diameter - hit 900 micrograms per cubic meter in southern Beijing on Monday. The WHO recommends a maximum limit of 25 micrograms per cubic meter.
Earlier this year, China's environment ministry announced that only eight of the country's 74 biggest cities had passed the government's basic air quality standards in 2014, and that many of the worst cities were in the northeast.
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