Coal Pollution Reduces Global Solar Output, Study Reveals
A recent study published in Nature Sustainability highlights the significant impact of coal pollution on global solar energy production. Researchers from the University of Oxford and University College London found that aerosols—tiny particles released from burning fossil fuels and natural sources—reduced global solar output by 5.8% in 2023. This reduction equates to approximately 111 terawatt-hours of electricity, comparable to the annual output of 18 medium-sized coal plants. The effect is particularly severe in regions where solar facilities are located near coal-fired power plants. For instance, in China, the world's largest producer of both solar power and coal, aerosols decreased photovoltaic output by 7.7%. Similar impacts were observed in India, the United States, and Japan. The study warns that the logistical benefits of co-locating solar farms near coal plants may be outweighed by the significant reduction in solar capacity caused by pollution. 
