Denver, CO – If you’ve felt unexpectedly dizzy, lightheaded, or unusually tired this spring, safety officials in Colorado say it may be worth checking more than your sleep schedule or daily stress.
According to fire safety and public health officials, mild carbon monoxide exposure often begins with symptoms that feel easy to dismiss — especially during late winter and early spring, when temperatures fluctuate sharply from day to night.
“Dizziness and headaches are often the earliest signs,” officials say. “And carbon monoxide is rarely the first thing people think about.”
Carbon monoxide (CO) is a colorless, odorless gas produced by furnaces, boilers, water heaters, fireplaces, gas stoves, and other fuel-burning appliances. Because it provides no smell or visible warning, exposure can build gradually inside homes and apartments.
Emergency responders across Denver County and El Paso County, including incidents reported in Denver and Colorado Springs, note that many residents experiencing early symptoms initially assume dehydration, altitude effects, seasonal illness, or lack of sleep.
Officials say spring warm-ups can increase risk in Colorado. Heating systems often continue running overnight during cold snaps, even as daytime temperatures rise significantly. That intermittent use — combined with closed windows at night — can allow ventilation or equipment issues to go unnoticed.
Symptoms often begin subtly: dizziness, nausea, fatigue, confusion, or a lingering headache that doesn’t feel typical. During long evenings indoors — including gatherings to watch major events like the big game — those warning signs are especially easy to ignore.
By the time carbon monoxide alarms sound — if they’re installed and working — exposure may already be serious.
Officials stress that carbon monoxide doesn’t follow seasons. It follows conditions.
As Colorado moves further into spring, safety experts urge residents to take unexplained symptoms seriously, test carbon monoxide detectors, and avoid assuming warmer weather means lower risk.
Sometimes, how you feel is the first warning.
