Air Quality Management And Greenhouse Gas Emissions Reductions

How are Air Quality Management And Greenhouse Gas Emissions Reductions related?

Approximately 6 million premature deaths occur annually due to air pollution, making it a major global health risk and top priority for international as well as national health and environmental politics. The main culprit for those deaths are small particles, especially particulate matter with a diameter of 10 μm (PM₁₀) or even the smaller particulate matter with diameter of 2.5 μm (PM_2.5). PM_2.5 consists of different ingredients, with one of the most important ones being black carbon (BC). 55-65% of anthropogenic BC emissions are generated mainly by industry and transport through the incomplete burning of fossil fuels. BC is a Short Lived Climate Pollutant (SLCP). Besides BC, the most common SLCPs are hydrofluorocarbons (HFCs), tropospheric ozone (O₃) and methane (CH₄). SLCPs are responsible for approx. 40% of global warming. They not only contribute to global warming and cause premature deaths, but also promote chronic diseases, e.g. acute respiratory infections or chronic obstructive pulmonary disease. Premature birth most likely is also related to air pollution, and it can hinder the effectiveness of antibiotics and medication. SLCPs also damage plants, reducing their photosynthesis and CO₂ absorption capacity, exacerbating hereby global warming and affecting agricultural yields. Reducing SLCPs therefore has positive effects on public health and on global warming alike. Reducing CH₄ and BC alone can lower global warming by approx. 0.5°C until 2050. Yet, since SLCPs are short lived in the atmosphere, their reduction has to go hand in hand with CO₂ reduction to have lasting effect. Luckily, some strategies to reduce SLCPs serve also to reduce CO₂ levels, e.g. regulations on fuel, phasing out coal burning etc.

Air Pollution in Lower and Middle Income Countries

Especially affected by air pollution are Lower and Middle Income Countries (LMIC). According to the World Bank, about 95% of adults and children impacted by pollution-related illnesses live in those countries. Those numbers show two things: the urgency to proactively address air pollution and the inability to do it effectively until now. Political arrangements, institutional settings, funds to tackle air pollution and greenhouse gas (GHG) emissions as well as knowledge about the impact of air pollution, its relation with GHG emissions and ways to counter it are insufficient and have to be addressed in most of those countries. This is due both to insufficient capacities as well as political will. While generally PM₁₀ -as one of the causes of deaths and illnesses due to air pollution- is considered in many countries' legal frameworks, the even more harmful PM_2.5 is not. In other LMICs' national air quality standards, related regulations and monitoring systems are missing altogether. The World Health Organization (WHO) stated in 2016: "In general, urban air pollution levels were lowest in high-income countries, with lower levels most prevalent in Europe, the Americas, and the Western Pacific Region. The highest urban air pollution levels were experienced in low- and middle-income countries with annual mean levels often exceeding 5-10 times WHO limits, followed by low-income cities. In the African Region, urban air pollution data remain relatively sparse, however available data revealed particulate matter (PM) levels above the median.

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