When the broader stock market indices are posting double-digit percentage gains for consecutive years, a mere 2% or 3% dividend yield may seem inconsequential. But when markets are under pressure and many stocks are falling, a steady stream of passive income can alleviate pressure on your portfolio.

United Parcel Service (NYSE: UPS), American Electric Power (NASDAQ: AEP), and Emerson Electric (NYSE: EMR) are three dividend stocks that look set to provide decades of passive income for your portfolio. Here's what makes each company a great buy now.

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Source Fool.com