Read the passage and fill in the blanks with the given words.
environment
diseases
pollution
emission
upgrading
If you wander on the streets of Ha Noi, the capital of Viet Nam, you may be surprised that most people are wearing masks, hiding their faces. This is because of serious air 1. ______ in this city. Between March 1 and 4, 2016, the air quality index of Ha Noi, as measured by the US Embassy in Ha Noi was over 350. At this level, air pollution can cause lots of respiratory 2. ________, especially to children and the elderly. The major cause of air pollution in Ha Noi is traffic. Due to the increasing number of motorcycles and cars in the last decade, the 3. __________ of chemical exhausts has been on a constant rise. Another reason is urban construction, including road 4. _______ projects and residential buildings. People have to live with the dust and dirt throughout the city. Environmental experts have warned that if the city continues to develop its economy with little regard to the 5.______, the consequence will be tragic.
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