Emission standards for coal mines
Pollutant	Time wighted Avg.	Concentration in Ambient Air			Method of Measurement
		New Coal Mines (Coal Mines coming up after Dec. 1998)	Existing coal fields/mines given below:  Karanpura, Giridih, Rajhara, Wardha, Nagpur, Silewara, Pench, Kanhan, Patharkhera, Urmer, Korba, Chirimiri, Central India Coalfields (including Baikunthpur, Bisrampur), Singrauli, Ib Valley, Tacher, and Godavary- Vally coalfields	Old Coal Mines -Jharia -Raniganj  -Bokaro
Suspended Particulate Matter (SPM)	Annual   Average*	360 mg/m3	430 mg/m3	500 mg/m3	High Volume Satmpling (Average flow rate not less than 1.1m3/minute)
	24 hours**	500 mg/m3	600 mg/m3	700 mg/m3
Respirable Particulate Matter (size less than 10 mm) (RPM)	Annual  Average*	180 mg/m3	215 mg/m3	250 mg/m3	Respirable Particulate Matter Sampler
	24 hours**	250 mg/m3	300 mg/m3	300 mg/m3
Sulphur Dioxide (SO2)	Annual  Average*	80 mg/m3	80 mg/m3	80 mg/m3	Improved west and Gaeke Method
	24 hours**	120 mg/m3	120 mg/m3	120 mg/m3	Utraviolet fluorescene
Oxide of Nitrogen as NO2	Annual Average*	80 mg/m3	80 mg/m3	80 mg/m3	Jacob & Hochheiser Modified (Na-Aresnic) Method
	24 hours**	120 mg/m3	120 mg/m3	120 mg/m3	Gas phase Chemilumine-scence
Note  : *   : Annual Arithmatic mean for the measurements taken in a Year, following  guidelines for frequency of sampling.
: ** : 24 hourly / 8 hourly values should met 98% of the time in a year. However 2% of the time it may exceed but not no two consecutive days.
1 - The ambient air quality standards shall apply to the nearest residential  / commercial places (existing / lilely) on the leaward direction on the mining and allied activities.
2 - Unauthorised construction will not be taken as a reference of nearest   residential / commercial place for monitoring.
Source : Environmental Standards for Ambient Air, Automobiles, Fuels, Industries   and Noise, Central Pollution Control Board, Ministry of Environment & Forest.