As urban air pollution affects the passage of daylight, photovoltaic panels lose efficiency finds study
Haze over cities is a visual reminder of the air pollution we breathe. This is less obvious than the coal smoke induced gloom that Victorians suffered. In the 1880s central London had just 17% of the winter sunshine that was measured in the countryside. This had only improved to 45% by 1916–20.
However, even modern haze is still reducing sunlight in cities. Scientists find that in Delhi air pollution over the city is reducing the efficiency of solar panels by between 12% and 17%, depending on the type of photovoltaic technology. Losses are between 9% and 13% in Beijing, and around 2% in London and Los Angeles.