What’s been top of mind for most Coloradans recently has been the air quality as of late.

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Smoke from Canadian wildfires has been filling up the Colorado skyline for the past few days and has seriously affected the quality of our air.

However, it’s already been an issue for quite some time now.

In fact, the Denver-Aurora Metro Area is the sixth worst region in the United States for air pollution

As it would turn out, cities along the Front Range like Fort Collins and Colorado Springs are also affected.

It’s to the point where Colorado was recently given $328 million in grants to fix this issue.

As it would turn out, the smoke has made it so Denver and the Front Range in general has some of the worst air quality in the world right now. 

Denver Rated Most Polluted City in US Again

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Yesterday, Denver was rated by the Swiss company IQAir as the most polluted city in the entire United States.

Overall, it placed in the top 10 worst globally, taking the 9th spot. It had a total score of 88, which means there was moderate air pollution.

However, it seems like this trend is continuing to roll along.

Today, Denver yet again tops the list for the U.S.

While it did go down in the global rankings to 13th, the air quality is actually worse today then it has been since this all began at 90. 

The next closest city in the United States is Salt Lake City, which is experiencing the same wildfire smoke. They are the 34th worst overall with a rating of 68.

In third is New York City, who sits as the 40th worst overall with a rating of 60.

What are the Most Least Polluted Cities in the World?

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Right now, the most polluted city in the world is Kinshasa in the Democratic Republic of the Congo. 

It has a truly staggering rating of 214, which is considered to be ‘very unhealthy’.

On the other end of the spectrum, the cleanest cities in the world right now are both Auckland, New Zealand and Oslo, Norway. Both of these places have a rating of 6.

Finally, the cleanest city in the United States right now is Houston, Texas. It has a rating of 18, which places it as the 7th cleanest city in the world.

See the Top 10 Most Polluted Zip Codes in Colorado

Industry, traffic, and even wildfires all contribute to the overall pollution found in the state of Colorado. Have you ever wondered which locations in Colorado have to deal with the highest amount of pollution? Take a look at the ten worst zip codes for pollution in Colorado by scrolling through the photos below.

Gallery Credit: Wesley Adams

Which One of Colorado's Major Rivers Is the Most Polluted?

Just how healthy are Colorado's major rivers? Which Colorado River is the most polluted? We're looking at Colorado's eight major river basins to find out which ones are in good shape and which rivers need some TLC.

Gallery Credit: Wesley Adams