Air Quality and West Nile Virus Update Al

Air Quality and West Nile Virus Update Al Brown, Director Maricopa County Environmental Services Department Dr. Jonathan Weisbuch, Director Maricopa County Public Health Department MAG Regional Council Meeting September 29, 2004 Ensuring a safe and healthy environment

Modeled Source Contributions for High Wind Exceedances

Modeled Source Contributions for Low-Moderate Wind Exceedances

August 13, 2004 PM-10 Data All Maricopa County Sites 150 ug/m 3 National 24 hour standard of 150 micrograms per cubic meter

Fugitive Dust MCDOT’s PM-10 • Maricopa County has 700 miles of unpaved roads • Year 4 of the PM-10 program • Paved more than 20 miles of dirt roads • Reduction in more than 1, 000 tons of particulates

West Nile Virus Update Goals • Prevent new cases of WNV • Safely apply mosquito control chemicals only as needed

Disease Severity Maricopa County Cases Neuroinvasive disease: West Nile Fever: Viremic Donors: Unknown: Deaths: Total Cases: 180 66 23 64 5 333 Estimated 25, 000 Infections Based on MCPHD Case Classification Criteria

Map of Arbovirus Surveillance Indicators, Phoenix metro, 2004

West Nile Virus Control Sites Density Map

Mosquito Sampling in Maricopa County in 2004 • 100 samples have tested positive • The estimated minimum infection rate was 20 to 40 per 1000 mosquitoes • The expected infection rate is 1 or 2 per 1000 mosquitoes

Number of Mosquito Complaints Filed Each Week

Number of Green Pool Complaints

Maximum Level of Effort • 14 trucks and 18 trailer foggers • 4 contracted pesticide applicator companies • In-house ability for 40, 000 acres per night • 120 mosquito traps

Maximum Level of Effort • 10 vector control employees • 13 temporarily assigned • 27 temporary employees • 50 employees assigned to WNV complaints

Fogging Criteria • • • Mosquitoes testing positive Birds testing positive Humans testing positive Horses testing positive Vector species greater than 10 per sample Observations by inspectors Complaints from residents Intergovernmental agreement commitments Large population of flood water mosquitoes

Public Education and Outreach 2004 • • • Press releases: 55 News conferences: 4 Media Appearances: 70 Presentations: 27 Brochures/posters: 280, 000 Door hangers: 30, 000

Is Fogging Effective? Chandler, Arizona Before Fogging 5 -9 -2004 1200 Cx. Tarsalis After Fogging 6 -3 -2004 16 Cx. Tarsalis 98. 7% reduction

Is Fogging Effective? Scottsdale, Arizona Before Fogging 8 -5 -2004 18 Cx. q, 2 Cx. Tarsalis After Fogging 8 -11 -2004 2 Cx. q, 0 Cx. Tarsalis 89% reduction Cx. q 100% reduction Cx. t

Is Fogging Effective? Mesa, Arizona Before Fogging 5 -7 -2004 7 Cx. q, 1 Cx. Tarsalis After Fogging 5 -8 -2004 2 Cx. q, 0 Cx. Tarsalis 71% reduction Cx. q 100% reduction Cx. t

West Nile Virus Cases by Week of Onset And Area Receiving Adult Mosquito Control

Is this year one or year two? • • • Planning for 2005 Ad Hoc Advisory Group to Meet This Winter Green Pool Strategy Storm Drain Cleanup Enhanced Surveillance Enhanced Public Education

QUESTIONS