Air pollution: how bad is particulate matter for your health?

Particulate pollution poses one of the greatest environmental risks to health, according to the WHO. So what is a safe level of exposure?Get our morning and afternoon news emails, free app or daily news podcastMany types of air pollutants are harmful to human health. These include gases - such as carbon monoxide, nitrous oxides and sulphur dioxide - and particulates.Particulate matter refers to microscopic solid or liquid particles that are suspended in the air. These can be human-made, such as from traffic emissions and the burning of fossil fuels, or natural, such as from sea spray or mineral dust from soils.Sign up for Guardian Australia's free morning and afternoon email newsletters for your daily news roundup Continue reading...