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These are the top 12 countries that emit the most sulfur dioxide (SO2) - a toxic air pollutant released when burning fossil fuels such as coal and oil. While SO2 pollution is invisible to our eyes, we’re likely breathing it right now, and its impacts can be deadly. What’s more, studies show that breathing polluted air day in and day out increases our chances of infections of and deaths from COVID-19. In 2019, human-made SO2 emissions decreased by 6% worldwide, but we are far from breathing safel