Air pollution has been linked to asthma, bronchitis, and other long-term respiratory diseases.
Some Mongolians drinking special teas named Enkhjin, Ikh Taiga, and Dr. Baatar that claim to clean lungs.
Dr. Baatar's CEO, Baatar Chantsaldulam, said sales surge by 20 to 30 percent during winter, when pollution tends to reach its peak.
"First it takes all the toxins out of the blood, then it turns the toxins in the lung into mucus, and all the plants in tea helps boost the human immune system," he told AFP.
But Maria Neira, the head of the WHO's public health department, said the "real solution" to protect the lungs and the cardiovascular system was to reduce air pollution and avoid exposure to it.
"The business community will offer plenty of those solutions," Neira said, referring to the oxygen cocktails and lung teas.
"We don't have any scientific evidence whether they provide any benefit," she said.
Non-profit organisations such as Parents Against Smog say the government is not doing enough to reduce air pollution and argue that ordinary people should not have to suffer financially to protect their health.
The group organised a sit-in protest earlier this year.
"For the past 10 years, people have known that air pollution has reached dangerous levels," Parents Against Smog coordinator Tumur Mandakhjargal told AFP.
"However, policymakers only address the issue by talking about passing out clean stoves and clean coal," Mandakhjargal said.
The NGO says the government should give some 200,000 ger residents access to loans so that they install heating insulation and replace their stoves with cleaner heaters. It also complains that a ger relocation plan has been too slow.
The government spent $120 million between 2008-2016 to combat pollution, with half of the funds coming out of its foreign aid revenue. Part of the money has gone to distributing low-emission stoves to residents of ger districts.
Last year, the parliament approved a tax exemption for companies that sell air purifiers, while Prime Minister Ukhnaa Khurelsukh issued an order to distribute $1.6 million worth of the appliances to all schools.
Non-profit organisations are giving away air purifiers and anti-smog masks to schools, kindergartens and hospitals.
The non-profit group Smog and Kids donated a South Korean-made air ventilation system to a kindergarten in one of the capital's most polluted areas, and the difference in air quality inside and outside the classrooms is palpable.
Such systems can cost up to $2,500 plus $500 for installation.
But Smog and Kids representative Tumendalai Davaadalai said air purifiers were not the answer to the problem.
"Mobile air purifiers don't give oxygen, they're not plants. The decision by Khurelsukh's cabinet to distribute air purifiers is a very bad decision," Davaadalai said.
"They are just funding businesses without any positive results."