Question raised in Lok Sabha on pollution due to suspended particles, 21/07/2015. The National Ambient Air Quality Standards (NAAQS) were revisited and notified in November, 2009. In line with international senerio, the earlier listed pollutant ‘Suspended Particulate Matter’ (SPM) has been withdrawn from the list of notified pollutants. Instead PM10 (particles having aerodynamic diameter less than or, equal to 10 micron) has been included in NAAQS-2009 apart from PM2.5. The monitoring of pollutant ‘SPM’ has been discontinued across the national including Delhi and other metro cities after NAAQS-2009. As far as, earlier data on SPM is concerned, a mixed trend was observed and it has exceeded the notified standards in a number of cities including Delhi.