Overview
- Tuxtla Gutiérrez entered a second day of orange-level air quality as Semahn reported PM2.5 at 32 µg/m³ and linked the spike to recent forest and grassland fires.
- New York State issued a PM2.5 health advisory for New York City with AQI forecast at 101–150 for Wednesday, covering all five boroughs plus Westchester and Rockland, with improvement expected Thursday.
- AirNow/EPA reported an extreme PM10 episode in California’s Imperial Valley with an AQI near 669 in the Hazardous range, triggering guidance to avoid outdoor activity.
- Mexico’s updated Norma 172, in effect since January 1, lowered the PM2.5 threshold from 33 to 25 µg/m³, increasing the number of officially recognized exceedances in Chiapas.
- Officials advise vulnerable people to avoid strenuous outdoor exercise, consider N95 masks if prolonged outdoor time is unavoidable, and keep indoor air as clean as possible.