Death in the air

May 12,2018

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The cost of pollution in human lives is often abstract due to the long-term nature of such deaths. The cost, however, is quite concrete: A new report estimates that 4.1 million people died as a result of ambient air pollution in 2016. And that’s a conservative estimate.

Globally, only five causes of death took a higher toll. (High blood pressure and smoking were the leading causes.)

That sobering report was issued this month by teams of researchers at the Health Effects Institute and the Institute for Health Metrics and Evaluation. Their report, State of Global Air 2018, sought to analyze worldwide air pollution exposures and health impacts; data for 2016 is used because that is the most recent data available. The report states:

“Worldwide exposure to PM2.5 contributed to 4.1 million deaths from heart disease and stroke, lung cancer, chronic lung disease, and respiratory infections in 2016. PM2.5 was responsible for a substantially larger number of attributable deaths than other more well-known risk factors (such as alcohol use, physical inactivity, or high sodium intake) and for an equivalent number of attributable deaths as high cholesterol and high body mass index. Ozone, another important component of outdoor air pollution, whose levels are on the rise around the world, contributed to 234,000 [additional] deaths from chronic lung disease.”

“PM2.5” refers to particulate matter less than or equal to 2.5 micrometers in aerodynamic diameter. Because particle pollution can travel deep into the lungs and cause or aggravate heart and lung diseases, there are numerous health hazards associated with it, including reduced lung function, development of respiratory diseases in children, aggravation of existing lung diseases and premature death of people with lung diseases, according to a U.S. Environmental Protection Agency overview that the Trump administration appears to not have gotten around to censoring. Sources include incomplete combustion, automobile emissions, dust and industrial activity.

This pollution is a global problem – the State of Global Air 2018 report notes that 95 percent of the world’s population lives in areas exceeding World Health Organization guidelines for healthy air, and almost 60% live in areas that do not meet even the WHO’s least-stringent air quality target. That widespread pollution adds up. The report states that “In 2016, long-term exposure to ambient PM2.5 contributed to 4.1 million deaths and to a loss of 106 million [disability-adjusted life-years], making PM 2.5 exposure responsible for 7.5% of all global deaths and 4.4% of all global DALYs.” (The term “DALY” refers to losses of healthy life and are calculated as the sum of the years of life lost from a premature death and the years lived with disability.)

Different countries have different source characteristics. In China, for example, industrial coal, transportation and residential biomass burning are the major sources of deaths attributable to air pollution, accounting for more than 400,000 deaths. In India, residential biomass burning is by far the single biggest culprit, responsible for an estimated 268,000 deaths. China has recently begun to slowly reverse an earlier rise in air-pollution deaths, but these remain on the increase in India. The report estimates that India could avoid up to 1.2 million deaths in 2050 through instituting more aggressive measures rather than simply keeping current practices in place.

The actual global total of 4.1 million might actually be an under-estimate. The report says its calculation does not include causes of death and disability for which evidence for a causal relationship with exposure to ambient PM2.5 is growing, such as the development of asthma in children, low birth weight and pre-term birth, type 2 diabetes and neurological disorders.

This article has been excerpted from: ‘If You Incentivize Pollution, You Incentive Death’.



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