Table B- 2 in ENVIRONMENTAL IMPACT ASSESSMENT (EIA) OF WORLD BANK FINANCED SIDDHIRGANJ 450 MW COMBINED CYCLE POWER PLANT (CCPP) PROJECT SIDDHIRGANJ, NARAYANGAJ

Table B-2 - Suggested Air Quality Impact Assessment Approach Baseline air•Qualitative information (for smallqualityprojects e.g., <100MWth)collection•Seasonal manual sampling (for mid-sized projects e.g., <1,200MWth)•Continuous automatic sampling (forlarge projects e.g.,>= 1,200MWth)•Modeling existing sourcesBaseline•Continuous one-year data formeteorologicaldispersion modeling from nearbydata collectionexisting meteorological station (e.g.,airport, meteorological station) or site-specific station, if installed, for mid-sized and large projectsEvaluation of•Determining if the airshed is degradedairshed quality(i.e., ambient air quality standards arenot attained) or non-degraded (i.e.,ambient air quality standards areattained)Air quality•Assess incremental and resultantimpactlevels by screening models (for smallassessmentprojects)•Assess incremental and resultantlevels by refined models (for mid-sizedand large projects, or for smallprojects if determined necessary afterusing screening models)47•Modify emission levels, if needed, toensure that incremental impacts aresmall (e.g., 25% of relevant ambientair quality standard levels) and thatthe airshed will not become degraded.