From a piece in the Deccan Herald titled Watch that air you breathe (emphasis mine):
Unless something is done soon, it would be adviseable for Bangaloreans to wear air masks when they step out.
The annual average of respirable particulate matter in the air monitored in the city shows high levels, much above national standards. …
For sensitive areas, the national standard has pegged a 50 unit value against 20 prescribed by WHO. In the city this figure crossed to 80!
Cough, dry cough, cough.