Question

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01. Calculate the PSI and identify the air quality descriptor for a city based on the following daily maximum values: 12 Hg/m 230 ug/m 1-hr Os 8-hr CO 24-hr SO2 325 ug/m 200 ug/m 24-hr TSP 1-hr NO2 1000 ug/m3 A proposed paper processing mill is expected to emit 50 kg of H2S per day from a 02. single stack. If the H2S concentration at the nearest town located 1700 m from the mill is not to exceed 28 ug/m2, estimate the required stack height at the mill, considering the following additional data: stack parameter diameter 2.5 m exit velocity 20 m/s 122° C exit temperature atmospheric conditions: pressure 98 kPa temperature 17° C Assume a wind speed of 2 m/s at the stack height and an atmospheric stability class of E

Answer 1

The breakpoints used in defining each of the six pollutant sub-indices are listed as follows: |24-hr PM2.5 24-hr 24-hr SO 1-hr NO 8-hr O 8-hr CO Index PM10 3 2 3 (ug/m) PSI 3 Category (mg/m (ug/m (ug/m)A (Hg/m) (Hg/m 0 5.0 Good 0 50 0-12 0-50 0 80 0 118 Moderate 51 100 13 55 51 150 81 365 5.1 10.0 119-157 Unhealthy 101 200 56 150 158 235 151 350 366 800 10.1 17.0 1130 Very Unhealthy 236 785 201 300 151 250 351 420 801 1600 17.1 34.0 1131 2260 421 500 1601 2100 786 980 301 400 251 350 34.1 46.0 2261 3000 Hazardous 501 -600 2101-2620 981 -1180 3001-3750 401 -500 351-500 46.1 57.5 (Note: "When 8-hour ozone concentration exceeds 785pg/m, the PSI sub-index is calculated using the 1-hour concentration; Sub-index for nitrogen dioxide is reported only when the 1-hour concentration equals or exceeds 1130 Hg/m3.)

Polluson Stamdard Imdex (PSi) is calcula fed the maximum at sub indices as PSI MaximUm (I,T3, IAn) a ers calulated as Iie Ijalsi xi-Xij) Lbj Xij iti Where XiObserved concenaahion fr the it polutant break the it poliutamt & PS value Ioje potnt as gien in table. for the poi lutant and m table break pomt as ren Xijj Concenha han f heH polluctamt ardit beak aen point as (oncentrafion for the i poltutami & jt at giem in table braakpoint to quesfon isven sub-indires accerd tho HOwever al folloues asra L'이-200] eetgacem 1 98 235

Tift 900 Xii isg 4 Ti Xijtl= 2 35 101 193.16 200-101 C230-18 01 235-188 C101-200) D 10-1 200-101 C2-10-1)-+i01 128 24 h TSP200g I &Pr 10 60th Calceulate fos Pi2 200u9/m(101-200) Pin 1o 300-20(200151) 2 50-157 P01-800 200-101 201 4200 224039 PM2.5 PM FO & 4 hy -so2 224 33 top-51-1o0 365 18 L00-S 324-81)100 = }५नु०१ 865-81 1000 ug m3 cohen 1-hY Nsab index for hr Noris veported ond Concenhratun equals o ex(tede 11304a 1m -maxinum C19316 128 2 0224.33, 141-19 2 S0 Tes

Effechve S2ack Height CHOlland formcula) Ts AH VS Cohere vS. St0ck velociy (mis) dStaCk diomeler (m) e coind speed P Pressiore CK Pa Ts stack temperature k) Ta air temperdture k) AS per Qu e0 fon VSE2OM S 2 m s 2 P-98KPa +273-395 K Ts- 122 Ta = 17c +273 29oK. 290 01-5+ (268x 103)(98) AH 2१० AH 17-37Im