Schedule 3 standards
 20. (1) A person shall not discharge or cause or permit the discharge of a contaminant listed in Schedule 3 into the air if a standard is set out in that Schedule for the contaminant for a specified averaging period and the discharge results in the concentration of the contaminant at a point of impingement exceeding that standard.  O. Reg. 419/05, s. 20 (1). (2) A person shall not discharge or cause or permit the discharge of a contaminant listed in Schedule 3 into the air if a standard is set out in that Schedule for the contaminant for a specified averaging period and the discharge would result, according to an approved dispersion model, in the concentration of the contaminant at a point of impingement exceeding that standard.  O. Reg. 419/05, s. 20 (2). (2.1) Subsections (1) and (2) do not apply with respect to a standard set out in Schedule 3 for a 10 minute averaging period.  O. Reg. 516/07, s. 15 (1). (2.2) A person shall not discharge or cause or permit the discharge of a contaminant listed in Schedule 3 into the air if a standard is set out in Schedule 3 for the contaminant for a 10 minute averaging period and the discharge results in the concentration of the contaminant exceeding that standard at a point of impingement where human activities regularly occur at a time when those activities regularly occur.  O. Reg. 516/07, s. 15 (1). (2.3) Subsection (2.2) does not apply if the discharge arises from, (a) an agricultural operation to which subsection 2 (1) of the Farming and Food Production Protection Act, 1998 applies; or (b) the use of an alarm system or warning system for health or safety reasons, including the use of an alarm system in an underground mine in accordance with Regulation 854 of the Revised Regulations of Ontario, 1990 (Mines and Mining Plants) made under the Occupational Health and Safety Act.  O. Reg. 516/07, s. 15 (1). (3) This section does not apply to a discharge of a contaminant from a facility unless, (a) the facility is part of a class identified by a NAICS code listed in Schedule 4 and, (i) the discharge occurs on or after February 1, 2010, or (ii) construction of the facility began after November 30, 2005 and no application was made on or before that day for a certificate of approval in respect of the facility; (b) the facility is part of a class identified by a NAICS code listed in Schedule 5, other than a class identified by a NAICS code listed in Schedule 4, and, (i) the discharge occurs on or after February 1, 2013, or (ii) construction of the facility began after November 30, 2005 and no application was made on or before that day for a certificate of approval in respect of the facility; (c) the Director has, in respect of the facility, approved a request under section 32 to set a site-specific standard for the contaminant, and the period referred to in subsection 35 (9) has begun; (d) compliance with this section is required by a notice given or order made by the Director under subsection (4) or (5) in respect of discharges of the contaminant from the facility; or (e) the discharge occurs on or after February 1, 2020.  O. Reg. 419/05, s. 20 (3); O. Reg. 516/07, s. 15 (2); O. Reg. 507/09, s. 16 (1); O. Reg. 282/11, s. 4. (4) The Director may give a person who discharges or causes or permits discharges of contaminants from a facility written notice requiring the person to comply with this section, beginning on a date specified in the notice that is not later than January 31, 2020, if the notice is requested in writing by the person.  O. Reg. 419/05, s. 20 (4); O. Reg. 507/09, s. 16 (2). (5) The Director may order a person who discharges or causes or permits discharges of a contaminant from a facility to comply with this section, beginning on a date specified in the order that is not earlier than February 1, 2010, is not earlier than three months after the order is made and is not later than January 31, 2020, if, (a) a report to which subsection 22 (1.2), 23 (3), 24 (2), 30 (5) or 33 (6) applies has been prepared and the report indicates that, if this section applied, discharges of a contaminant from the facility might result in a contravention of this section; and (b) the Director is of the opinion that discharges of the contaminant from the facility may result in an adverse effect.  O. Reg. 419/05, s. 20 (5); O. Reg. 605/05, s. 4; O. Reg. 507/09, s. 16 (3, 4). (6) Revoked:  O. Reg. 507/09, s. 16 (5).