Indoor Environmental Monitoring

Air Quality Index Daily indoor AQI readings, two monitors averaged, compared against a Gardena outdoor reference.

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Air Quality Index US EPA AQI bands

Color zones follow the US EPA AQI categories (Good 0–50, Moderate 51–100, Unhealthy for Sensitive Groups 101–150). California uses this same federal AQI.

Good 0–50 Moderate 51–100 USG 101–150 Unhealthy 151+ Outdoor avg (Gardena est.) Outdoor peak-day (est.)

Estimated time-of-day peaks modeled

Windows are inferred from the facilities operating, area traffic, and industrial corridor patterns.

ParameterPrimary peakSecondary peakMain drivers
AQI
(particulate-led)		 3:00–7:00 PM 7:00–9:00 AM Afternoon = peak outdoor infiltration layered onto evening commute and industrial-corridor traffic. Morning bump from the AM commute.
Notes & sources
  1. Data: daily indoor AQI values, two building monitors averaged where both reported; gaps filled by the single monitor that did. Values read from app Week/Month line charts, so daily figures are good estimates, not raw device logs.
  2. Gardena outdoor AQI is derived from the LA Almanac monthly air-quality table (sourced from EPA AirNow / AQI Daily Values for LA County), converted from each month's day-category distribution into a category-weighted representative AQI and a worst-category peak, then coastal-adjusted for Gardena's South-Bay location (county avg ×0.82, peak ×0.80, since coastal South Bay typically runs cleaner than inland county sites like Azusa/Glendora). It is a monthly county-derived estimate, not a measured Gardena station feed. Sources: laalmanac.com/environment/ev01b.php; EPA AQI Daily Values Report.