What Is the Air Quality in Santa Cruz, Arizona?

Santa Cruz, Arizona earns a C — air quality is fair, but not great. With a 5-year median AQI of 43, the city sees a meaningful number of "Moderate" days each year, when the EPA flags air as a concern for unusually sensitive people.

Santa Cruz, Arizona's 5-year median AQI of 43 is 2 points above the national average of 41 — meaningfully more polluted than the typical U.S. metro tracked here. Within Arizona, Santa Cruz, Arizona runs cleaner than the state average of 46 — a positive signal that local conditions (terrain, wind patterns, emission sources) are working in residents' favor.

For context within Arizona: Apache, Arizona currently holds the state's cleanest grade (A, AQI 13), while Maricopa, Arizona sits at the bottom (F, AQI 90).

Air quality in Santa Cruz, Arizona has been getting worse over the past decade, with median AQI climbing by roughly 0.3 points per year. That bucks the national trend of broad improvement, and most often reflects either growing wildfire smoke exposure (particularly across the West) or rising local emissions from population and freight growth.

In 2014, Santa Cruz, Arizona posted a median AQI of 38. By 2023 that figure was 37 — a drop of 1 AQI points cleaner across 10 years of EPA records.

Across the past five years, this area has logged just 11 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 2 days per year, or roughly one every other month. That is a low count by national standards.

Healthy adults can continue normal outdoor activity in most weather, but should pay attention to AQI alerts during the worst pollution windows. People with asthma, heart disease, or pregnancy should reduce prolonged or intense outdoor exertion on flagged days, and consider running an indoor HEPA air cleaner during peak season. Because PM2.5 penetrates deep into the lungs and bloodstream, an N95 or KN95 mask provides meaningful protection on smoky or high-particulate days — surgical masks do not.