Vietnam airport construction dust blankets homes, schoolbr br A thick layer of dust from the construction of a huge airport in Vietnam has been blanketing nearby neighborhoods for months, staining everything from trees to homes to school children's uniforms a sickly shade of red.br br Located 40 kilometers from southern business hub Ho Chi Minh City, the four-runway Long Thanh airport -- which will be the country's largest -- is forecast to transport 100 million passengers and five million tonnes of cargo annually once finished.