Mumbai, Jan. 19 -- The city witnessed a sharp rise in air pollution on Saturday as a marginal increase in temperatures was recorded. The air quality index (AQI) was recorded at 167 for PM2.5 pollutant, falling under the 'moderate' category as against an AQI of 89 (satisfactory) on Friday and 81 (satisfactory) on Thursday, according to the System of Air Quality Weather Forecasting and Research (SAFAR)....