It’s another hot, sunny, blue-sky day in Denver. The air is still and looks clear! Despite the beautiful day, you may feel irritation in your throat or a tightness in your chest while out walking the dog, at the park, riding your bike, or on an afternoon run. Your asthma may also be acting up.
This is likely the impact of ground-level ozone: the Front Range’s most pressing air quality problem each summer. We can’t see or smell it, but this pollutant accumulates the most on hot and sunny blue-sky days, reaching its highest levels in the afternoons and evenings.
While ozone serves an important purpose high up in the atmosphere — protecting us from the sun’s ultraviolet radiation — at ground level, high concentrations of ozone are unhealthy. Ozone makes it difficult to breathe, increases our susceptibility to respiratory infections, and exacerbates respiratory ailments such as asthma.
High ozone levels affect all of us. Even if you are healthy, ozone can impact the cells in your lungs during and after exposure, like sunburn, and repeated exposure over time can lead to reduced lung function. The people at higher risk of exposure or more sensitive to this air pollution include the elderly, those with respiratory conditions, outdoor workers, outdoor athletes, and especially children, whose lungs are still developing.
Where does this air pollution come from? Ground-level ozone is not directly emitted from any source. It forms in the air when two chemicals, volatile organic compounds (VOCs) and nitrogen oxides (NOx), react in the sunshine and heat of summer days. These chemicals are called ozone precursors, and they are released into the air from emissions made by our gas-powered vehicles, gas-powered lawn equipment, and oil and gas production across the Front Range.
Both colorless and odorless, ozone is different than wildfire smoke, tiny particulate matter called PM2.5 or PM10, and the visible Denver “brown cloud” of years past. However, ozone can combine with other air quality issues, and is sometimes referred to as “smog.”
While air quality in the Front Range has improved over the years, ozone remains a pressing issue to our health and environment. But, we all have the power to reduce ground-level ozone in the Front Range each summer!
First, sign up for ozone alerts. Visit SimpleStepsBetterAir.org to sign up for emails or text “BetterAirCO” to 21000 to receive air quality alerts on your phone. When the Colorado Department of Health and Environment (CDPHE) forecasts a high ozone day, the Regional Air Quality Council (RAQC) will send you a timely text or email to let you know.
On high ozone days, protect your health by avoiding outdoor exercise or heavy exertion between noon and 8 p.m. Still want to get outside? Plan ahead and spend time outside in the morning, or later in the evening, when ozone levels will be lower.
Second, reduce your emissions! Take some Simple Steps for Better Air: Skip two car trips per week by carpooling, combining errands, or taking the bus or the light rail to get where you need to go. Don’t forget: youth ride for free on RTD! For shorter distances, leave the car at home and walk, ride a scooter, or your bike or e-bike.
Fuel up your car after 5 p.m. to avoid releasing emissions during the heat of the day. Skip idling your car: instead, roll down the windows and turn off the engine while waiting in parking lots or lines. Consider a low- or zero-emissions vehicle, like an electric vehicle (EV), when it’s time to purchase a new vehicle.
Mow the lawn after 5 p.m. if you still use gas-powered equipment. Even better, upgrade your old gas lawn mower, trimmer, or leaf blower to a new electric one with a 30% state discount at participating retailers this year!
And if your job can be done remotely, work from home at least one day a week and eliminate your commute altogether.
Taking these timely, simple steps in the summer improves our Front Range air quality, our health, and our ability to enjoy the outdoors! Visit SimpleStepsBetterAir.org for more information about how to reduce your ozone impact this summer and help your community breathe easier.
Simple Steps. Better Air. is a program of the Regional Air Quality Council.
