The Morongo Band of Mission Indians Quality Monitoring Project was funded through the California Air Resources Board Community Air Monitoring Grant Program (AB 617). The objective of the project is to place air monitors in various locations around the Morongo Reservation to measure and report air quality data in real-time.
This air monitoring network uses sensors that continuously detect airborne particulate matter equal to or less than 10 micrometers in diameter (PM10), particulate matter equal to or less than 2.5 micrometers in diameter (PM2.5), nitrogen dioxides (NO2), and ozone (O3). These pollutants are considered “criteria air pollutants” and are regulated by the US Environmental Protection Agency under the Clean Air Act. This air monitoring network also detects the presence of volatile organic compounds (VOCs). In addition to these ambient air quality pollutants, the monitors also measure relative humidity, barometric pressure, and temperature.
Data from the air monitors is used to calculate Air Quality Index (AQI) values on the data page to provide context to the public on potential air pollution levels and how it relates to health risks. The AQI can be used by the public to reduce their exposure to potentially harmful levels of air pollution.
Air Quality Index Details
The Air Quality Index (AQI) (formerly known as the Pollutant Standards Index) was issued on July 23, 1999 by the U.S. EPA for daily air quality reporting to the public. The index is designed to provide accurate, timely and easily understandable information about daily levels of air pollution and ranges from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern. An AQI value of 100 generally corresponds to the national air quality standard for the pollutant, which is the level EPA has set to protect public health. The AQI reflects revisions to the primary health-based national ambient air quality standards for ground-level ozone and particulate matter issued by U.S. EPA in 1997.
The intervals, color code assignment, and the terms describing the AQI
are as follows:
|AQI Index Values
|Levels of Concern
|Description of Air Quality
|0 to 50
|Air quality is satisfactory, and air pollution poses little or no risk.
|51 to 100
|Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
|101 to 150
|Members of sensitive groups may experience health effects. The general public is less likely to be affected.
|151 to 200
|Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.
|201 to 300
|Health alert: The risk of health effects is increased for everyone.
|301 and higher
|Health warning of emergency conditions: everyone is more likely to be affected.
For more detailed information about the AQI, please visit the U.S. EPA’s AirNow website:
The data presented on this website includes ambient outdoor levels of ozone (O3), nitrogen dioxide (NO2), two sizes of fine particulate matter (PM2.5 and PM10), and volatile organic compounds (VOCs). Pollutants are continuously monitored, and results are updated every 60 seconds — refresh your browser to get the latest results.
Gases are measured using passive chemical electrode sensors that output voltages in response to changing levels of pollutants in the air. Algorithms are used to convert these voltages into concentrations of O3 and NO2.
Due to the sensitivity of sensors utilized in the air quality monitoring units, changes in temperature and humidity can impact pollutant concentration levels. Data reported during storm events may not be as reliable as during mild weather conditions.