That is the agency disclosing, proactively and in its own words, that two of its air monitors could go dark. Regulatory Monitors Carry the Official NumberUnderstanding why two stations matter requires knowing how the county's headline AQI is built. The current air quality figure Spokane Clean Air publishes represents the highest reading of the predominant pollutant among its regulatory monitoring sites. Whether Avista's shutoff planning treats air monitoring stations as critical infrastructure the way it treats some other facilities. The agency's site-by-site map and AirNow.gov, both drawing on regulatory monitors, are updated hourly at 35 minutes past the hour.