Dinner on the patio? First, hold the stench

DES MOINES, Iowa (AP) — Parts of downtown Des Moines have been so transformed in the past decade by new apartments, trendy shops and microbreweries, it’s sometimes hard to reconcile the present with the not-so-distant past.

But one strong reminder of the city's heritage remains: the stench. A pungent smell of rancid meat regularly wafts through all the shiny new development, a reminder of the region’s less polished history as a pork processing center.

"You can't escape it,” said Brandon Brown, president of the Des Moines Downtown Neighborhood Association, calling it “very frustrating.”

Many cities eager for new investment and vitality have welcomed urban housing and entertainment venues into older sections of town that housed grittier industries, only to be stumped by what happens when someone like Brown, who moved into an upscale downtown apartment, actually wants to enjoy a latte or meal at an outdoor patio.

After decades of downplaying or simply ignoring the problem, Des Moines officials recently began a comprehensive study that will lead to tighter regulations on some smelly manufacturing plants to finally clear the air.

Similar difficulties are cropping up in other cities with smelly businesses, especially rendering plants that are common in agricultural regions and even some big cities. Angry residents are deluging officials with complaints and filing lawsuits, while some leading companies are installing new equipment, making payments to neighbors or even closing down.

No one tracks such disputes, but Iowa State University professor Jacek Koziel, who studies air quality and livestock odors, said he thinks the conflicts may be increasing. Sometimes, as in Des Moines, it’s because more noses are nearer the bad smells, but in other spots, it's that residents are...