SNAPS - Data Display
Air Monitoring Snapshot
Air Quality Index (AQI)
Hourly AQI (combined PM2.5 and O3) for the SNAPS measurement site(s) and nearby regional air monitoring stations are shown below (AQI, see AirNow for more information and full calculation methods). A description of AQI colors and values are shown in the table.
Comparison to Health Standards
Average concentrations and ambient air quality standards (where applicable) are displayed below. Any air quality concerns can be reported here.
Please note: Data displayed on this page is preliminary and is subject to change. The charts show hourly pollutant concentrations and do not necessarily depict impacts from oil and gas sources. Source attribution will be conducted once all pollutant and meteorological measurements are collected. This analysis will be used to attribute air pollution to specific sources or source sectors in the final report.
Hourly pollutant concentrations for the past seven days are shown below. Pollutants measured in real-time measurements include particulate matter (PM), ozone (O3), methane (CH4), hydrogen sulfide (H2S), black carbon (BC), carbon monoxide (CO), and wind speed and direction. Shaded boxes indicate when the instrument is offline for calibration or maintenance. Information on air monitoring technology can be found here and documentation specific to SNAPS monitoring can be found here.
Hover the mouse pointer over the chart to view the values and the time or measurement. Click and drag on the chart area to select and zoom on a particular region of the chart. To return to the default view, double-click on the chart.
Interactive Weekly Graphics
PM2.5 and Ozone
Hourly average concentrations of PM2.5 and O3 are shown below.
Hydrogen Sulfide and Methane
Hourly average concentrations of H2S and CH4 from the past week are shown below. Oil and gas operations may lead to the emission of the greenhouse gas methane (CH4) and the hazardous gas hydrogen sulfide (H2S). H2S is a naturally occurring gas within petroleum and natural gas with a distinct "rotten egg" smell at low concentrations; however, it can be odorless at higher concentrations. The State of California ambient air quality standard for H2S is 30 ppb for a 1-hr average concentration to reduce unpleasant odors. While odors related to H2S can be detected at concentrations as low as 30 ppb, the U.S. Environmental Protection Agency does not classify H2S as a Hazardous Air Pollutant due to its minimal health impacts at typical ambient concentrations (https://oehha.ca.gov/media/downloads/crnr/oehhah2s.pdf).
Carbon Monoxide and Black Carbon
Carbon monoxide (CO) gas and black carbon (BC) particles, a subcomponent of PM2.5, are emitted during fuel combustion. The SNAPS trailer monitors both these pollutants and the hourly concentrations are displayed in the charts.
Wind Speed and Direction
The direction and strength of the wind (1-minute averages) is summarized over the past week (top) and last 24 hours (bottom). This diagram is a "wind rose" and consists of segments shaped like a wedge. Wedges indicate the relative frequency and direction of the wind measured at the SNAPS site. Large segments indicate that the wind predominantly came from this particular direction. The color within each segment indicates the strength of the wind from that direction (listed on the legend). The numbers on the chart indicate the percentage of measurements that were recorded from each direction and wind strength.
The data shown here is a subset of the suite of pollutants measured in the SNAPS program. Data not shown include pollutant measurements that require significant data processing and/or measurements that require collecting air samples on sampling media which must then be analyzed in a laboratory. All collected data will be included in the final report for each community.