One positive impact of the stay-at-home order was that air pollution lessened dramatically across America's cities. Though it's one of the USA's top tourist spots, Los Angeles is also renowned for its traffic-choked roads and poor air quality.

However, reports in spring 2020 suggested that the city boasted some of the cleanest air in any major world city. A bright blue sky and the snow-crowned San Gabriel Mountains are a beautiful backdrop for LA's skyscrapers in this 2020 shot.

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