With more care about safety of food in general and vegetable in special, the seriousness of air pollution in big city in Vietnam, citizens are now planting more fresh vegetables in their houses, especially in the rooftop. The research was carried on by personal interviews with 252 respondents in Thainguyen city, a big city in the Northeast area of Vietnam, to describe the situation and affecting factors toward the willingness to practice the "rooftop vegetable garden". The results of research

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... ow that only 33.7% respondents had high willingness to practice the "rooftop vegetable garden", however, there're up to 43.7% respondents who have "rooftop vegetable garden". Five factors have effects on practitioners' willingness to practice the "rooftop vegetable garden":1. Urban environment pollution, 2. Urgency of fresh vegetable, 3. Knowledge about farming on the roof, 4. Time to practice and 5. Lifestyle. And three factors effects on non-practitioners' willingness to practice the "rooftop vegetable garden":1. Lack of knowledge about farming on the roof; 2. It is easier to buy than to grow fresh vegetables and 3. Lack of time.