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<br /> <br />Table 2.3- 3 <br />Pasquill Atmospheric Stability Categories <br /> Temperature <br /> Weather Wind Speed Change with Height <br />Category Stability Condition Description (Meters/Sec) ( C/100M) <br /> <br />A Extremely Unstable Very Sunny Sumner <br /> Weather 1 -1.9 <br />B Moderately Stable Sunny and Warm 2 -1.9 to -1.7 <br />C Slightly Unstable Average Days 5 -1.7 to -1.5 <br />D Neutral Overcast Day or Night 5 -1.5 to -0.5 <br />E Slightly Stable Average Night 3 -0.5 to 1.5 <br />F Moderately Stable Clear Night 2 -1.5 to 4.0 <br />G Extremely Stable - - - - 4.0 <br /> Relations to Weather Conditi ons <br />Surface W ind Speed Daytime Insolation Nightime Conditions <br /> <br /> Thin Overcast <br /> or 4/8 3/8 <br />Meters/Sec. Strong Moderate Slight Cloudiness Cloudiness <br /> <br />' 2 A A-B 6 <br />2 A-B B C E F <br />4 B B-C C D E <br />6 C C D D D <br />6 C C D D D <br /> <br />2- 20 <br />