Mumbai-based Awaaz Foundation has written to the police and Maharashtra government after a chemical test revealed the presence of highly toxic substances in firecrackers.

The NGO had on Thursday conducted separate tests to assess noise levels and presence of chemicals in firecrackers. The organisation along with the Maharashtra Pollution Control Board (MPCB) had tested noise levels of firecrackers and found that they all fell within the permissible decibel limit of 120, the foundation's convener Sumaira Abdulali said.