should be below 2500 parts per million according to the EPDs Practice Note for

Should be below 2500 parts per million according to

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should be below 2,500 parts per million, according to the EPD’s Practice Note for Managing Air Quality in Air- conditioned Public Transport Facilities, published in 2003. The lower the concentration of carbon dioxide, the fresher the air supply is likely to be.
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39 Unit 11 Prepositions of place & movement Unit 11 Prepositions of place & movement DEVELOPING SKILLS Set B Grammar & Usage P.91 P.91 ARTICLE ARTICLE The MTR (1) ________________________________________ _____________________ ( keep/concentration/carbon dioxide ) in its stations as low as possible by (2) ___________________ ______________________________ ( use/ventilation shaft ). Fresh air (3) ________________________________________ ( draw/into/these shafts ) and filtered before it reaches the station concourses and platforms. keeps the concentration of carbon dioxide using ventilation shafts is drawn into these shafts
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40 Unit 11 Prepositions of place & movement Unit 11 Prepositions of place & movement DEVELOPING SKILLS Set B Grammar & Usage P.91 P.91 BACK BACK assengers travelling underground breathe fresher air than people in cinemas and restaurants, according to the Mass Transit Railway. The railway company provides as much as five litres of fresh air per person per second inside the trains, a particularly high level of ventilation for passengers. It also keeps carbon dioxide levels well within the Environmental Protection Department’s guideline. P P NEXT NEXT
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41 Unit 11 Prepositions of place & movement Unit 11 Prepositions of place & movement DEVELOPING SKILLS Set B Grammar & Usage P.91 P.91 BACK BACK The hourly average of carbon dioxide in railway carriages should be below 2,500 parts per million, according to the EPD’s Practice Note for Managing Air Quality in Air- conditioned Public Transport Facilities, published in 2003. The lower the concentration of carbon dioxide, the fresher the air supply is likely to be. PREVIOUS PREVIOUS
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42 Unit 11 Prepositions of place & movement Unit 11 Prepositions of place & movement DEVELOPING SKILLS Set B Grammar & Usage Another method used (4) ______________________________ ___________________________ ( keep/air/supply/fresher ) is the ‘piston effect’. When a train is travelling through a tunnel, (5) ______________________________ ( it/push/air/in front of/it ). This (6) ____________________________________________ ( allow/fresh air/draw/from/behind ). Ventilation shafts at both ends of the tunnel then regulate the air inflow and outflow. P.91 P.91 ARTICLE ARTICLE to keep the air supply fresher it pushes the air in front of it allows fresh air to be drawn from behind
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43 Unit 11 Prepositions of place & movement Unit 11 Prepositions of place & movement DEVELOPING SKILLS Set B Grammar & Usage BACK BACK P.91 P.91 assengers travelling underground breathe fresher air than people in cinemas and restaurants, according to the Mass Transit Railway. The railway company provides as much as five litres of fresh air per person per second inside the trains, a particularly high level of ventilation for passengers. It also keeps carbon dioxide levels well within the Environmental Protection Department’s guideline. P P NEXT NEXT
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44 Unit 11 Prepositions of place & movement Unit 11 Prepositions of place & movement DEVELOPING SKILLS Set B Grammar & Usage
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