Air quality in Hanoi has deteriorated over the last three days and is unlikely to get better in the coming days, experts say.

The capital's Air Quality Index (AQI) was recorded at 136 on Tuesday evening by 11 air monitoring stations scattered throughout the city.

Areas with worst air quality had 27% increase in bipolar disorder analysis found.

People who grow up in areas with poor air quality are more likely to develop depression and bipolar disorder in later life, a new study has suggested.

Analysis of health data from millions of patients found a “significant link” between mental health disorders and exposure to air pollution, especially in childhood.

The lung development of children could be stunted by the release of microplastics from car tyres, according to an investigation.

Toxic particles emitted from all vehicles including exhaust fumes, metallised rubber and brake dust, are contributing to poor air quality in cities, a study for Channel 4's Dispatches has discovered.

The findings came from an experiment conducted by the programme and scientists from King's College London (KCL).

With so many different air “purifiers” available for a vast range of prices, it may be difficult to decipher what is worthwhile and what is, well, worthless. It can be tempting to settle for an inexpensive air purifier, especially when it is promoted with jargon and promises.

Hanoi has seen air quality improve over the past year but it remains one of Southeast Asia’s most polluted cities.

The city’s average PM2.5 level last year was 40.8 micrograms per cubic meter of air as opposed to 45.8 in 2017, according to Switzerland-based air quality monitor IQAir AirVisual's 2018 World Air Quality Report.

Hanoi stood second in Southeast Asia in terms of air pollution just behind Jakarta, according to a 2018 World Air Quality Report jointly conducted by Greenpeace and IQAir AirVisual.

The report was made following data from dozens of air quality monitoring stations across the world.

The report showed that up to 99% of South Asian cities; 95% of Southeast Asian cities and 89% of those in East Asia surpassed the allowed PM2.5 level.

Goldach, Switzerland 5 March 2019 -- Air pollution will take an estimated seven million lives globally in the next year, while costing the world’s economy nearly 225 billion USD.^1,2 The latest data compiled in the World’s Most Polluted Cities ranking, reveals the state of particulate matter (PM2.5) pollution in 2018. It highlights a widespread but unequal distribution of PM2.5 pollution and limited access to public information.

Another reason for including asthma on the list of potential health risks posed by secondhand tobacco smoke, especially for non-smokers, has been uncovered. Furthermore, the practice of using ozone to remove the smell of tobacco smoke from indoor environments, including hotel rooms and the interiors of vehicles, is probably a bad idea.

Scientists called study’s findings upsetting and said toxic air must be cut.

Air pollution is as bad for pregnant women as smoking in raising the risk of miscarriage, according to a scientific study. They said the finding was upsetting and that toxic air must be cut to protect the health of the next generation.

Air pollution is already known to harm foetuses by increasing the risk of premature birth and low birth weight. Recent research has also found pollution particles in placentas.