Graphs reveal how air pollution has changed since the Industrial Revolution UK cities have made significant reductions since ...

Air pollution is even more dangerous than previously thought, the World Health Organization (WHO) has warned, as it slashes maximum safe levels of key pollutants such nitrogen dioxide. An ...

(see Graph 1: Hourly movement of PM2.5 in Delhi ... Differing trend during the day: Interestingly, the daytime (6 AM to 4 PM) ...