law: National Environment Appellate Authority Act, 1997
  11. Appeals to Authority. –
  (1) Any person aggrieved by an order granting environmental
  
  clearance in the areas in which any industries, operations or processes or
  
  class of industries, operations and processes shall not be carried out or shall
  
  be carried out subject to certain safeguards may, within thirty days from the
  
  date of such order, prefer an appeal to the Authority in such form as may be
  
  prescribed :
  Provided  that the Authority may entertain any
  
  appeal after the expiry of the said period of thirty days but not after ninety
  
  days from the date aforesaid if it is satisfied that the appellant was
  
  prevented by sufficient cause from filing the appeal in time.
  (2) For the purposes of sub-section (1),
  
  "person" means -
  (a) any person who is
  
  likely to be affected by the grant of environmental clearance;
  (b) any person who owns
  
  or has control over the project with respect to which an application has been
  
  submitted for environmental clearance;
  (c) any association of
  
  persons (whether incorporated or not) likely to be affected by such order and
  
  functioning in the field of environment;
  (d) the Central
  
  Government, where the environmental clearance is granted by the State
  
  Government and the State Government, where the environmental clearance is
  
  granted by the Central Government; or
  (e) any local
  
  authority, any part of whose local limits is within the neighborhood of the
  
  area wherein the project is proposed to be located.
  (3) On receipt of an appeal preferred under
  
  sub-section (1), the Authority shall, after giving the appellant an opportunity
  
  of being heard, pass such orders, as it thinks fit.
  (4) The Authority shall dispose of the appeal
  
  within ninety days from the date of filing the appeal :
  Provided  that the Authority may for reasons to
  
  be recorded in writing, dispose of the appeal within a further period of thirty
  
  days.