Hydrogen sulfide data
Near-real-time H₂S concentrations from our monitoring stations near the Tijuana River, reported as 1-minute averages.
Located in the Nestor neighborhood (Leon Avenue), approximately 0.5 miles from the Tijuana River hotspot.
Located near the Imperial Beach Pier, monitoring coastal air quality conditions.
Data is preliminary
These near-real-time data have not yet undergone full review, validation, and calibration. Short-term spikes or drops may occur during instrument startup, power outages, maintenance, or data transmission interruptions. These temporary effects do not necessarily represent actual environmental conditions.
Single-point measurement
Measurements reflect air quality at a single monitoring location and may not represent conditions across the broader community. H₂S levels can change rapidly depending on wind direction, weather, temperature, and distance from emission sources including the Tijuana River.
Use for awareness, not diagnosis
These data support community awareness and precautionary actions — like turning on indoor air filters or closing windows during odor events. They should not be used as the sole basis for medical, health, regulatory, or legal decisions.
H₂S is only part of the picture
Low or undetectable H₂S does not mean clean air. As shown in Rico et al. (Science), contaminated waterways can emit hundreds to thousands of other airborne chemicals not measured by this instrument. These values represent partial and preliminary information.
Help researchers understand how environmental conditions relate to sleep and daily health. Report odors and air quality concerns to SDAPCD.
Participation is optional, anonymous, and voluntary.