National Ambient Air Quality Standards (NAAQS)
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- 09/01/2018
- 09/01/2018

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* : Annual Arithmetic Mean of minimum 104 measurements in a year taken twice a week 24 hourly at uniform intervals. : 24 hourly or 8 hourly monitored values, as applicable, shall be complied with 98% of the time in a year. 2% of the time, they may exceed the limits but not on two consecutive days of monitoring.Whenever and wherever monitoring results on two consecutive days of monitoring exceed the limit specified above for the respective category, it shall be considered adequate reason to institute regular / continuous monitoring and further investigations.
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Statistical Hand Book 2016 : Environment
Open Government Data(OGD) Platform Tamil Nadu