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Sore throats, coughs and stinging eyes are symptoms many people have noticed on hazy days, but the impacts of long term exposure are a mystery.
The Cameron Peak Fire flared back up Saturday and burned more buildings.
Colorado is not projected to be part of the areas in the upper part of the United States where the aurora borealis might be visible in the night sky overnight.
Firefighters responded overnight to a fire at a house that was under renovation.
Scientists at the National Renewable Energy Lab in Golden have invented a new polyurethane that originates from algae, waste grease, or natural oils.
Secretary of State Jena Griswold is trying to clear up any confusion after a story by CBS4 about a voter registration mailing by her office.
Elk Fest in Estes Park kicks off on Monday. The town has celebrated the rut for the last two decades.
The Larimer County Sheriff's Office reports crews were assessing new damage Sunday morning.
The Mullen Fire in Wyoming - just north of the Colorado state line - nearly doubled in size from Saturday to Sunday.
Family and friends of a Thornton couple set up a GoFundMe page after they were hit and killed Saturday night.
The Colorado Bureau of Investigation issued a Medina Alert for a vehicle involved in a hit-and-run crash in Denver.
Artists and volunteers in Denver started a community mural in honor of the late Justice Ruth Bader Ginsburg.
A 30-mile hike is nothing for a moose with a taste for city life.
The annual pilgrimage to Colorado's high country to see golden, orange and red leaves means traffic backups and illegal parking in many places.
Denver police responded to a deadly shooting near Monaco Parkway and 1st Avenue early Sunday morning.
In his first State of the City address since taking office, Denver Mayor Mike Johnston says he's made dramatic progress and will make an even greater impact in the coming year.
The South Adams County Fire Department revamped its travel and expense policies following a CBS News Colorado investigation showing thousands of taxpayer dollars used for department spouses to travel to professional conferences.
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Watch Chief Meteorologist's Dave Aguilera smoke forecast
Fort Collins police responded to a single-vehicle rollover crash Sunday. When officers arrived, a man -- later identified as Clayton Pierce -- was standing outside his car with a gun, the police department said.
The owner of Wheel Fun Rentals is trying to figure out what to do with around 40 large swan boats and dozens of bikes after the city decided to take over rentals.
Police in Timnath are looking for information on a grass fire that broke out late Saturday night.
Keystone Resort brought back its celebration of our service members with the Military Winter Games, welcoming active duty and former service members for a weekend of competition and connection on the slopes.
The City of Denver wants to bring the first-ever full-service restaurant to Civic Center Park.
Three Colorado residents are currently serving prison sentences following a 16-year-old girl's drug overdose.
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In this edition of Making Ends Meet, Arapahoe County libraries have built a place to work and connect- for free! It has workspace areas, meeting rooms and even a place to record podcasts.
Colorado lawmakers to announce legislation in response to last fall's Evergreen High School shooting.
Paddleboats and surrey bikes have been a popular activity at both Wash Park and City Park in Denver for decades. The company who operates them says the city is pushing them out and taking over their idea.
Months after a devastating fire destroyed a shopping center in Colorado's Nederland community, the cleanup of the building remains in limbo.
The 31-year-old Puerto Rican artist Bad Bunny took the stage on Sunday dressed in all white, donning a jersey with his last name, Ocasio, and the number 64.
Team USA defended its Olympic figure skating team event gold medal on Sunday after Ilia "Quad God" ushered the team to victory at the Milan Cortina 2026 Winter Olympics.
President Trump criticized Team USA freestyle skier Hunter Hess after he and other American athletes at the 2026 Winter Olympics shared their thoughts on U.S. politics.
Breezy Johnson took the lead early on after flying down the mountain in 1:36.10. It is her first-ever Olympic medal.
Lindsey Vonn, who came out of retirement to compete in the Milano Cortina Games, is in stable condition after her crash.
The 31-year-old Puerto Rican artist Bad Bunny took the stage on Sunday dressed in all white, donning a jersey with his last name, Ocasio, and the number 64.
Team USA defended its Olympic figure skating team event gold medal on Sunday after Ilia "Quad God" ushered the team to victory at the Milan Cortina 2026 Winter Olympics.
Republicans and Democrats in Congress are locked in a standoff over reforming the nation's immigration enforcement operation as a deadline to reach a resolution and fund the Department of Homeland Security approaches.
A whistleblower complaint includes highly-classified details about a National Security Agency intercept of a call between two foreign nationals who discussed a person close to President Trump, two sources said.
President Trump criticized Team USA freestyle skier Hunter Hess after he and other American athletes at the 2026 Winter Olympics shared their thoughts on U.S. politics.
Republicans and Democrats in Congress are locked in a standoff over reforming the nation's immigration enforcement operation as a deadline to reach a resolution and fund the Department of Homeland Security approaches.
A whistleblower complaint includes highly-classified details about a National Security Agency intercept of a call between two foreign nationals who discussed a person close to President Trump, two sources said.
President Trump criticized Team USA freestyle skier Hunter Hess after he and other American athletes at the 2026 Winter Olympics shared their thoughts on U.S. politics.
Nexstar's acquisition of Tegna would bring together two companies with significant holdings in local broadcast media.
Skier Chris Lillis said he was "heartbroken about what's happened in the United States," while skater Amber Glenn said she "will not just be quiet."
Colorado health officials have issued a safety notice over batches of marijuana contaminated with yeast and mold sold in 31 stores across the state over the past two-and-a-half months.
Becca Valle, then 37, enrolled in a cutting-edge clinical trial after surgery removed an aggressive tumor from her brain.
The Trump administration launched its new TrumpRx direct-to-consumer prescription drug listing site late Thursday, part of a push to offer medication at steep discounts.
On Colorado's Eastern Plains, danger can strike faster than help can reach you. For one rancher in Sterling, a simple chore in his land turned into the fight of his life.
People who call 911 in Aurora for non-emergency medical issues now have the option to be connected to a doctor virtually instead of having an ambulance sent to their location.
Here's how much Bad Bunny earned from his halftime performance at Super Bowl LX.
Colorado health officials have issued a safety notice over batches of marijuana contaminated with yeast and mold sold in 31 stores across the state over the past two-and-a-half months.
Design plans for the community include walking trails, play areas, community gardens, and indoor gathering spaces. The property sits next to Expo Park and a city recreation center, the Highline Canal Trail, and transit access.
Nexstar's acquisition of Tegna would bring together two companies with significant holdings in local broadcast media.
Though the commerce secretary has called his interactions with Epstein as "limited," the two were in business together four years after Epstein's 2008 guilty plea.
Denver drivers continue to be impacted by a change in how parking tickets are disputed. That system changed in September, when the city eliminated the ability to dispute parking tickets online.
Former Denver Police Chief Paul Pazen, who retired as chief in 2022, plans to announce next week that he is running for a seat on Denver City Council.
Colorado parents are raising concerns after a dispute between their school district and its water provider put the school's future firefighting water supply in question.
An Arapahoe County judge ordered Aurora resident Daniel Alexander Ashby to stand trial for felony assault, after witnesses say Ashby body-slammed defense lawyer H. Michael Steinberg in a courthouse hallway last December.
Newly released documents from the Lakeside Police Department say former Sgt. Howard Prince admitted to cheating on his time records, but also said that in an interview, the sergeant said he didn't know why he falsified his time sheets.
