Amid concerns over high pollution levels in the national capital, Union Minister Piyush Goyal on Monday asked real estate developers to adopt environment-friendly construction techniques and suggested CREDAI to set up a team to study the adverse impact of construction activities on air quality of 20 major cities. Addressing realtors' apex body CREDAI's 25th foundation day, the Union Commerce and Industry Minister also asked developers to build affordable rental housing projects to prevent the proliferation of slums in urban centres. Goyal also suggested CREDAI members to consider venturing into overseas markets to tap opportunities in real estate development and redevelopment. "I had asked CREDAI to consider setting up a team to study whether, at least in the metropolitan cities or the 20 top towns of the country, where we can see the impact of construction leading to pollution, leading to air quality deteriorating." He stressed the need to adopt better construction techniques usin