It can change depending on the season and weather, but it is seriously bad and hit #1 for a day in 2017. [1] The geography does trap the pollution, but having

It can change depending on the season and weather, but it is seriously bad and hit #1 for a day in 2017. [1] The geography does trap the pollution, but having refineries and mining operations just north of the city doesn't help. There are also loads of 18 wheel trucks coming through, since SLC is a bit of a hub area in terms of highways. Despite the city being pretty walk-able with decent (by US standards) transit, lots of people have at least one large 4x4 vehicle to get up into the canyons. It hurts to see since I understand the appeal of outdoors activities, but this way of approaching them will degrade and ruin the outdoors long term. [1] https://kutv.com/news/local/salt-lake-city-has-the-worst-air-quality-in-the-nation https://kutv.com/news/local/salt-lake-city-has-the-worst-air...