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11. | Developed in end of 1950 and beginning of 1960 for the need of Roadway air dispersal model, National environmental policy act and U.S. Department of transportation ( then high way known by Union Administration. New quality of air on high ways, especially in urban areas Hackai research group were active in development of group sample, some of them were following: Environmental Research & Technology (ERT)research group of Lexington and Massachusetts, ESL inc of Sunnyvale and California, California air resources board of Inc. group and Sacramento, California. Research of ESL group United States Environmental Protection Agency promote sulphur hexafluoride as tracer gas, this program was successful as Line Sorce Model developed by ESL inc. सड़क वायुमण्डलीय प्रकीर्णन मॉडल (roadway air dispersion model)राष्ट्रीय पर्यावरण नीति अधिनियम (National Environmental Policy Act) और अमेरिका के परिवहन विभाग (U.S. Department of Transportation)की जरूरत के लिए १९५० के अंत में और १९६० के शुरू में विकसित हुआ ( तब राजमार्ग संघीय प्रशासन के नाम से जाना गया )राजमार्गों पर नई हवा की गुणवत्ता विशेष रूप से शहरी क्षेत्रों में हैकई अनुसंधान समूह नमूने विकास में सक्रिय रहे जिनमें से कुछ निम्न थे: लेक्सिंगटन मैसाच्युएट्स (Lexington Massachusetts) का एन्वायरनमेंटल रिसर्च एंड टेक्नोलॉजी (ERT) ग्रुप सनीवेल कैलिफ़ॉर्निया (Sunnyvale California) का ESL इंक. Inc. ग्रुप और सैक्रामेंटो कैलिफ़ॉर्निया (Sacramento California) का कैलिफ़ॉर्निया एयर रिसॉर्सेस बोर्ड (California Air Resources Board) ग्रुप.ई एस एल समूह के शोध संयुक्त राज्य अमेरिका पर्यावरण सुरक्षा एजेंसी (United States Environmental Protection Agency) से सल्फर हेक्जाफ्लोराइड (sulfur hexafluoride) अनुरेखक गैस के रूप में मान्यता के लिए बढावा देता है यह कार्यक्रम ESL inc के द्वारा विकसित लाइन स्रोत मॉडल में सफ़ल था. |
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