Study paints grim pollution picture
![](http://admin.indiaenvironmentportal.org.in/files/Air_P16_3.jpg)
Kolkata: Abnormally high PM2.5 (particulate matter measuring less than 2.5 micron in diameter) levels in Kolkata's air nearly all through the year, except monsoon, is a major killer and may assume
Publication Date:
19/09/2016