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

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 National 24 hour standard of 150 micrograms per cubic meter 150 ug/m 3

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

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

Disease Severity Maricopa County Cases Neuroinvasive disease: West Nile Fever: Viremic Donors: Unknown:Deaths: Total Cases: 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 samples have tested positive100 samples have tested positive The estimated minimum infection rate was 20 to 40 per 1000 mosquitoesThe estimated minimum infection rate was 20 to 40 per 1000 mosquitoes The expected infection rate is 1 or 2 per 1000 mosquitoesThe 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 foggers14 trucks and 18 trailer foggers 4 contracted pesticide applicator companies4 contracted pesticide applicator companies In-house ability for 40,000 acres per nightIn-house ability for 40,000 acres per night 120 mosquito traps120 mosquito traps

Maximum Level of Effort 10 vector control employees10 vector control employees 13 temporarily assigned13 temporarily assigned 27 temporary employees27 temporary employees 50 employees assigned to WNV complaints50 employees assigned to WNV complaints

Fogging Criteria Mosquitoes testing positiveMosquitoes testing positive Birds testing positiveBirds testing positive Humans testing positiveHumans testing positive Horses testing positiveHorses testing positive Vector species greater than 10 per sampleVector species greater than 10 per sample Observations by inspectorsObservations by inspectors Complaints from residentsComplaints from residents Intergovernmental agreement commitmentsIntergovernmental agreement commitments Large population of flood water mosquitoesLarge population of flood water mosquitoes

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

Chandler, Arizona Cx. Tarsalis Before Fogging After Fogging Is Fogging Effective? Cx. Tarsalis 98.7% reduction

Scottsdale, Arizona Cx.q, 2 Cx.Tarsalis Before Fogging After Fogging Cx.q, 0 Cx.Tarsalis 89% reduction Cx.q 100% reduction Cx.t Is Fogging Effective?

Mesa, Arizona Cx.q, 1 Cx.Tarsalis Before Fogging After Fogging Cx.q, 0 Cx.Tarsalis 71% reduction Cx.q 100% reduction Cx.t Is Fogging Effective?

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

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

QUESTIONS