ʹַ

© 2025
NPR News, Colorado Stories
Play Live Radio
Next Up:
0:00
0:00
0:00 0:00
Available On Air Stations
ʹַ is among the founding partners of the Mountain West News Bureau, a collaboration of public media stations that serve the Western states of Colorado, Idaho, Nevada, New Mexico, Utah and Wyoming.

Summer heat could contribute to harmful air quality across the Mountain West

An aerial view of Las Vegas and some of its buildings can be seen in the foreground, with the some of its suburban sprawl stretching far in the background and the mountains even farther back. It's a little hazy during the daytime.
Creative Commons
Several counties in the Mountain West region are already struggling with poor air quality, and summer heat could make things worse. One of those places is Clark County in Nevada, which includes Las Vegas.

Several counties across our region do not meet federal standards for safe air quality. Some are expected to experience potentially harmful air quality during the warm months ahead.

Seven of the eight Mountain West states have at least one county that violates the Environmental Protection Agency’s . It’s a complicated set of factors that measures air quality.

The most problematic issues are a combination of particulates from wildfires, ground-level ozone pollution and heat.

The forecasts that most of the Mountain West will be “above” the average warmth or “likely above” in the three months ahead.

The areas surrounding Las Vegas are already facing an air quality advisory for the entire summer. It’s an issue that places like Las Vegas face every summer and it continues to get worse.

“And we’ve seen three of our last six or seven years – our highest years for exceedance dates for ozone were also years we had heavy wildfire smoke come into Clark County,” said Clark County Air Quality Division spokesperson Kevin MacDonald. “We have smoke from hundreds of miles away. So pollutants that will blow in from Southern California or even overseas will come into Clark County and settle in and that helps cook ozone.”

Phoenix and Albuquerque face similar issues with the same topography and high heat. Counties in higher elevations surrounding Denver and Salt Lake City are also expected to face high levels of pollutants this summer.

Real time air quality updates can be accessed at .

This story was produced by the Mountain West News Bureau, a collaboration between Wyoming Public Media, Nevada Public Radio (KNPR) in Las Vegas, Boise State Public Radio in Idaho, KUNR in Nevada, ʹַ in Colorado and KANW in New Mexico, with support from affiliate stations across the region. Funding for the Mountain West News Bureau is provided in part by the .

Yvette Fernandez is the regional reporter for the Mountain West News Bureau. She joined Nevada Public Radio in September 2021.