THE ADMINISTRATOR OF THE ENVIRONMENTAL PROTECTION AGENCY

The Honorable John Marcus Chairman of Santa Rosa Band

of Cahuilla Indians P.O. Box 391820 Anza, California 92546 Dear Chairman Marcus: WASHINGTON , D
. C
. 20460


# DEC 1 

# a2014

I would like to summarize the U.S. Environmental Protection Agency's recent action to address fineparticle pollution on your reservation. As required by the Clean 

### Air Act, the EPA has determined which areas are meeting the national ambient-air-quality standards for fine-particle po llution and which areas must take steps to reduce emissions that contribute to violations ofthe standard. The EPA on December 14,2012, strengthened the annual, health-based fine-particle standard from 15.0 micrograms per cubic meter

**(~J.g/m**

**)** to 12.0

**~J.g/m**

**.** Thousands of scientific studies have linked exposure to these tiny particles

- approximately 1/30th the size of a human hair- with serious health problems including premature death in people with heart and lung disease, nonfatal heart attacks and increased hospital admissions and doctor and emergency-room visits for respiratory and cardiovascular disease. I appreciate the information you and your staffhave shared with the EPA throughout this process to assess fine-particle-pollution levels in communities across your reservation and the impact of emission so urces that could be contributing to unhealthy air. After considering your recommendations, reviewing the most recent certified fine-particle air-quality data for your reservation and evaluating factors to assess contribution to nearby levels offine-particle pollution, I have determined that no area within the Santa Rosa Band of Cahuilla Indians reservation violates the 2012 standard or contributes to a nearby violation ofthe standard. As a result, the EPA is des ignating all ofthe Santa Rosa Band of Cahuilla Indians reservation " unclassifiable/ attainment. " Because air-quality monitoring for 2014 is nearly complete, the EPA, at a tribe 's request, will evaluate the status of an area based on its annual fine-particle-monitoring data for 2012-14. If you would like the EPA to re-evaluate any areas within your reservation, please submit complete, quality-assured and certified air

-quality data for 2014 to the EPA by February 27,2015. I recognize that the EPA shares responsibilit y with the states and tribes for managing particle-pollution levels. Efforts by states and tribes to attain the 1997 and 2006 fine-particle-pollution standards are already wo rking to reduce unhealthy levels of fine-particle pollution. In addition, current and upcoming federal sta ndards and safeguards, including pollution-reduction rules for power plants, vehicles and fuels will ensure steady reductions offine-particle pollution and will protect public health in communities across the nation.

This paper is printed with vegetable-oil-based inks and is 100-percent postconsumer recycled material , chlorine-lree-processed and recyc lableTogether we have made considerable progress in reducing fine -p article pollution. Nationw id e monitored l evels of fine-particle po ll ution have fa ll en 34 percent since 2000 when we first began such monitoring for particles of this size. I am confident this progress will continue as we work toward our shared goa l of clean air.

For additional information about these designations, p l ease visit www.epa.gov/pmdesignations . Sincerely,