§ 11-4. Air quality objectives.

A. 

Point of measurement shall be between six feet and 200 feet aboveground in the ambient air at any point within the City of Norwalk.

B. 

SO₂ levels at point measurement shall not exceed the following limits: twenty-four-hour average, 0.05 ppm or 131 ug/M; one-hour average, 0.10 ppm or 262 ug/4. (25° C. SP)

C. 

Soiling index at point of measurement shall not exceed the following limits: twenty-four-hour average, 1.0 Coh/1,000 feet; two-hour average, 3.0 Coh/1,000 feet.

(1) 

Automatic smoke samplers which continuously produce a record of the time, duration and density or opacity of air contaminants shall be recommended equipment for all stacks connected to fuel- or refuse-burning installations rated at or greater than 10,000,000 BTU per hour.

D. 

Total suspended particulates at point of measurement shall not exceed the following limits: twenty-four-hour maximum, 200 ug/M; weekly average, 80 ug/M; and within the city the yearly arithmetic average all stations shall not exceed 60 ug/M.

E. 

Hydrogen sulfide at point of measurement shall not exceed the following limit: any time, 0.1 ppm.

F. 

Carbon monoxide at point of measurement shall not exceed the following limits: twenty-four-hour average, five ppm; eight-hour average, 15 ppm; one-hour maximum, 20 ppm; maximum at any time, 30 ppm.

G. 

Total oxidants at point of measurement shall not exceed the following limits: twenty-four-hour average, 0.05 ppm; one-hour average, 0.10 ppm; maximum at any time, 0.15 ppm.