5 Dangerous Pollutants You’re Breathing In Every Day

2 November 2021 (UNEP)* — Air pollution is an invisible killer with a stranglehold on many parts of our fragile planet. Nine out of 10 of us breathe air containing levels of pollutants that exceed World Health Organization limits. Every year, around 7 million people die from diseases and infections related to air pollution – that’s more than five times the number of people killed in road collisions and more than the official death toll of COVID-19. 

Ground-level ozone

Ground-level ozone, or tropospheric ozone, is a short-lived climate pollutant and although it exists only for a few days to a few weeks, it is a strong greenhouse gas. It forms when pollutants from industry, traffic, waste and energy production interact in the presence of sunlight.

It contributes to smog, worsens bronchitis and emphysema, triggers asthma, damages lung tissue and reduces crop productivity. Exposure to ground-level ozone causes an estimated 472,000 premature deaths every year. Because ozone stunts the growth of plants and forests, it also reduces the amount of carbon that can be sequestered.

Nitrogen Dioxide

Nitrogen oxides are a group of air polluting chemical compounds, including nitrogen dioxide (NO2) and nitrogen monoxide. NO² is the most harmful of these compounds and is generated from the combustion of fuel engines and industry. It can damage the human heart and lungs and it reduces atmospheric visibility at high concentrations. Finally, it is a critical precursor to the formation of ground-level ozone.

Black Carbon

Black carbon, or soot, is a component of PM2.5 and is a short-lived climate pollutant. Agricultural burning to clear land, and the wildfires that sometimes result, are the world’s largest sources of black carbon. It also comes from diesel engines, burning trash, and stoves and furnaces that combust fossil and biomass fuels.

It causes poor health and premature death and also increases the risk of dementia. Black carbon emissions have been decreasing over the past decades in many developed countries due to stricter air quality regulations. But emissions are high in many developing countries where air quality is poorly regulated. As a result of open biomass burning and residential solid fuel combustion, Asia, Africa and Latin America contribute approximately 88 per cent of global black carbon emissions.

Methane

Methane comes mainly from agriculture, particularly livestock, sewage and solid waste, and oil and gas production. It helps create ground-level ozone and hence contributes to chronic respiratory illnesses and premature death.

Intergovernmental Panel on Climate Change research shows that methane – a major short-lived climate pollutant – is responsible for at least a quarter of today’s global warming and reducing human-caused methane, which accounts for more than half of all methane emissions, is one of the most effective ways of combatting climate change.

*SOURCE: UNEP. Go to ORIGINAL.
2021 Human Wrongs Watch