The writing process for the majority of Metallicaâs albums have followed the same process. A large slew of guitar riffs written primarily by James Hetfield, sometimes Kirk Hammett, and rarely the bandâs bass player, (that now being bass virtuoso Robert Trujillo) are reviewed and selected.
1 Delhi is most polluted city in the world in PM2.5 concentrations. 2  Half of the top 20 most polluted cities were in India, according to data.  PM2.5 is considered most harmful to health.
According to the paper, from 2002 to 2010, Bangalore saw the second highest increase in air-pollution levels in the world at 34%, and Indian cities including Pune, Mumbai, Nagpur and Ahmedabad, among others, also saw double-digit increases.