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Among the biggest gainers was a group of enterprise software companies that went public in 2018: Avalara, Smartsheet and DocuSign.

Ambient air pollution affects urban and rural areas. Major sources include inefficient energy use in households, industry, the agriculture and transport sectors, and coal-fired power plants. In some areas, sand and desert dust, waste burning and deforestation are additional sources of air pollution. Air quality can also be influenced by natural elements such as geographical, meteorological and seasonal factors.

Amazon’s stock has risen 68 percent since the start of the year, pushing its market cap over 5 billion, according to Yahoo Finance, in early trading Thursday. But some analysts see that number skyrocketing in the next few years.

Amazon’s market value is about 0 billion, compared with Alibaba’s market value of more than 0 billion. Alibaba’s shares are up slightly in early trading today.

Among the latest achievements is a new artificial intelligence-driven chip unveiled by Alibaba that specializes in machine-learning tasks. The chip is currently being used in optimizing consumer experience product searches and automatic translation on e-commerce sites, personalized recommendations, advertising, and intelligent customer services.