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PM10 dispersion modeling for Treasure Valley, Idaho
Journal of the Air & Waste Management Association (1995)
|September 26, 2000
Summary
Exceedances of the 24-hr PM10 National Ambient Air Quality Standard (NAAQS) in Treasure Valley are linked to winter stagnation. Reducing mobile-source emissions by 25% is crucial to meet air quality standards.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Air Quality Modeling
Background:
- Treasure Valley, Idaho experiences frequent exceedances of the 24-hour PM10 National Ambient Air Quality Standard (NAAQS).
- These exceedances are often associated with prolonged winter stagnation periods, trapping pollutants near the ground.
- A State Implementation Plan (SIP) is required to address these air quality challenges.
Purpose of the Study:
- To conduct a comprehensive modeling study of PM10 (particulate matter with a diameter less than 10 micrometers) impact in Treasure Valley.
- To support the development of effective air quality planning requirements and emission control strategies.
- To evaluate the effectiveness of different emission reduction scenarios.
Main Methods:
- Utilized the ISCST3 (Industrial Source Complex Short Term 3) model with base-year meteorology and gridded emissions (mobile, point, wood burning).
- Prepared and extrapolated an emission inventory from a base year (1995) to future years (2000, 2005, 2010, 2015).
- Employed the WYNDvalley model, validated with monitoring data, to simulate PM10 impacts during episodic stagnant winter conditions.
Main Results:
- The ISCST3 model showed good agreement with temporal patterns and annual averages of measured PM10 concentrations.
- Simulations using base-year emissions and meteorology did not predict exceedances.
- Projected emissions combined with episodic meteorology indicated potential exceedances at certain monitoring stations.
- Emission control strategy simulations identified mobile-source emissions as having the most significant impact.
Conclusions:
- A 25% reduction in mobile-source emissions is necessary to eliminate simulated PM10 exceedances in all projected years.
- Targeted emission controls, particularly on mobile sources, are essential for improving air quality in Treasure Valley.
- The study provides critical data for the State Implementation Plan (SIP) to address PM10 non-attainment issues.