Maharashtra Pollution Control Board or MPCB officials have also cited national air monitoring standards developed by the centre in 2009 to justify Mumbai's deteriorating air quality. According to the centre's measurement standards, Particulate Matter (PM) standards are 60 micrograms for PM10 and 40 micrograms for PM2.5.
In stark contrast, the World Health Organisation's air quality measurement standards are 20 micrograms for PM10 and 10 micrograms for PM2.5.
Particulate matter recorded by the WHO for Mumbai stood at PM2.5 and PM10 as 64 and 104 respectively.
Particulate matter contains many pollutants like sulphate, nitrite oxide and black carbon, which if inhaled, lead to severe health complications.
"Dust and pollution has increased due to the construction activities because of which our weather has changed as well. So, some children get frequent coughs because of rapid weather fluctuations," says Dr Indu Khosla, a pediatrician in Mumbai.
In the future, she adds, children might develop more allergic symptoms even if they are not genetically predisposed to do so.
"MPCB is in consultations with the transport department to convert diesel vehicles to CNG," he said, also acknowledging rapid construction as the second most serious problem affecting air quality.
"We are working with industries in the cities to come to an agreement of using clean fuel. And with construction related pollution, the board is trying to enforce the new construction and demolition rules 2016 which has a scientific approach of disposable pollution," he said.
14 Indian cities figured in the list of the 20 most polluted cities of the world in the WHO's report. 10 of these cities registered high levels of PM2.5, with New Delhi registering levels of the most dangerous particles in the air, sometimes 10 times higher than the safe limit.
The report also says that nine out of 10 people on the planet breathe polluted air, killing 7 million people each year.