Clark County's air quality continues to improve—including a 12 percent reduction in ozone since 2007, despite receiving questionable grades in the American Lung Association's annual State of the Air report. The report—which analyzes air quality data from 2016 - 2018—gave Clark County a failing grade for ozone, which is rated 'good' or 'moderate' 93.5 percent of the time, according to the U.S. Environmental Protection Agency's health-based standards. For Clark County's air quality division at its Department of Environment and Sustainability, the numbers do not add up.
"If we're applying the American Lung Association's arbitrary and subjective grading scale, anything below 99.2 percent is considered failing," said Department of Environment and Sustainability Director Marci Henson. "That doesn't make sense to us."
Ozone is a colorless gas that exists naturally in the Earth's upper atmosphere. At ground level, ozone is a key ingredient of urban smog that can build up during the day in the hottest months of the year because of strong sunlight, hot temperatures, gasoline and chemical vapors, pollutants from automobiles, wildfires and regional transport. According to the EPA, exposure to ozone can irritate your respiratory system and cause coughing, a sore throat, chest pain and shortness of breath even in healthy people.
Henson argues the EPA's standards provide a fair, objective and health-based reading of air quality data through its National Ambient Air Quality Standards (NAAQS). According to the EPA, Clark County's air quality is in attainment for five of the six criteria pollutants it is required to monitor: carbon monoxide, nitrogen dioxide, lead, particulate matter (PM10 and PM2.5) and sulfur dioxide. The County is in marginal nonattainment for ozone, the EPA's lowest level of nonattainment.
"Though our air quality is good and continues to improve, ozone continues to be our No. 1 challenge during the summer months," said Henson. "However, with the exception of wildfire years in 2017 and 2018, ozone has been on the decline for the past several years."
Despite the rebuke of the grade, Henson believes the Dept. of Environment and Sustainability and the American Lung Association are allies fighting for the same cause: protecting the air we share.
"We have a great relationship with our local chapter of the American Lung Association," said Henson. "Both our organizations strive to achieve the same goals. Despite our disagreement with their report, we will continue to build on our partnership at the local level to educate and inform our community about how we protect the air we share and also how individuals can protect it, too."
The Dept. of Environment and Sustainability invites residents to adopt a few simple practices to help lower ground-level ozone pollution:
- Keep your car well maintained, including proper air pressure in tires.
- Map out errands and trips to ensure the most efficient routes.
- Take public transportation.
- Fill your gas tank after sunset.
- Use electric landscaping equipment instead of gas-powered.
About the Department of Environment and Sustainability
The Department of Environment and Sustainability is the air pollution control agency, regional Endangered Species Act compliance program, and sustainability office for all of Clark County, Nevada. Established as the Department of Air Quality by the Clark County Commission in 2001, it was renamed in 2020 and is comprised of three divisions: Air Quality, Desert Conservation Program and Office of Sustainability. Through the work of these three divisions, DES is ensuring the air we share meets healthful, regulatory standards, administering the County's Multiple Species Habitat Conservation Plan and addressing climate change.
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Clark County is a dynamic and innovative organization dedicated to providing top-quality service with integrity, respect and accountability. With jurisdiction over the world-famous Las Vegas Strip and covering an area the size of New Jersey, Clark is the nation's 11th-largest county and provides extensive regional services to more than 2.3 million citizens and 45 million visitors a year. Included are the nation's 9th-busiest airport, air quality compliance, social services and the state's largest public hospital, University Medical Center. The County also provides municipal services that are traditionally provided by cities to about 1 million residents in the unincorporated area. Those include fire protection, roads and other public works, parks and recreation, and planning and development.