Moderate air quality for the Rio Grande Valley on Thursday

HARLINGEN, Texas (ValleyCentral) — Noticing gray, hazy skies? It’s not just clouds, it’s also pollution across the Rio Grande Valley.  On Thursday, expect sunny but hazy conditions again, driven by ground-level ozone (O₃). This gas forms when pollutants like nitrogen oxides and volatile organic compounds (VOCs) react with sunlight, and it’s a major component of smog.  We’re also seeing PM2.5 particles, tiny inhalable pollutants (2.5 micrometers or smaller) from vehicle emissions, power [...]