Improving air quality in India requires long-term effort, a senior US scientist has said and noted cost-intensive technologies such as smog towers and cloud seeding are not sustainable solutions to the pollution problem plaguing the country. In an interview with PTI, Richard Peltier, a member of the World Health Organization's (WHO) Global Air Pollution and Health Technical Advisory Group, said there is a good understanding that air pollution is "really quite bad" across India but precision is lacking due to the limited distribution of air pollution monitors.