Section 12June 23, 1999, Sec./Art. 12

Ambient Air Quality Guideline Values and Standards. - The Department, in coordination with other concerned agencies, shall review and or revise and publish annually a list of hazardous air pollutants with corresponding ambient guideline values and/or standard necessary to protect health and safety, and general welfare. The initial list and values of the hazardous air pollutants shall be as follows:

(a) For National Ambient Air Quality Guideline for Criteria Pollutants:

Short Term a

Long Term b

Pollutants

g/Ncm

ppm

Averaging Time

g/Ncm

ppm

Averaging Time

Suspended Particulate

Matterc

-TSP

230d

24 hours

90

----

1 yeare

-PM-10

150f

24 hours

60

----

1 yeare

Sulfur Dioxidec

180

0.07

24 hours

80

0.03

1 year

Nitrogen Dioxide

150

0.08

24 hours

----

----

----

Photochemical Oxidants

140

0.07

1 hour

----

----

----

As Ozone

60

0.03

8 hours

----

----

----

Carbon Monoxide

35 mg/Ncm

30

1 hour

----

----

----

10 mg/Ncm

9

8 hours

----

----

----

Leadg

1.5

----

3 monthsg

1.0

----

1 year

a Maximum limits represented by ninety-eight percentile (98%) values not to be exceed more than once a year.

b Arithmetic mean

c SO2 and Suspended Particulate matter are sampled once every six days when using the manual methods. A minimum of twelve sampling days per quarter of forty-eight sampling days each year is required for these methods. Daily sampling may be done in the future once continuous analyzers are procured and become available.

d Limits for Total Suspended Particulate Matter with mass median diameter less than 25-50 um.

e Annual Geometric Mean

f Provisional limits for Suspended Particulate Matter with mass median diameter less than 10 microns and below until sufficient monitoring data are gathered to base a proper guideline.

g Evaluation of this guideline is carried out for 24-hour averaging time and averaged over three moving calendar months. The monitored average value for any three months shall not exceed the guideline value.

(b) For National Ambient Air Quality Standards for Source Specific Air Pollutants from Industrial Sources/Operations:

Pollutants1

Concentration2

Averaging time (min.)

Method of Analysis/ Measurement3

/Ncm

ppm

1. Ammonia

200

0.28

30

Nesselerization/ Indo Phenol

2. Carbon Disulfide

30

0.01

30

Tischer Method

3. Chlorine and Chlorine Compounds expressed as Cl2

100

0.03

5

Methyl Orange

4. Formaldehyde

50

0.04

30

Chromotropic acid Method or MBTH Colorimetric Method

5. Hydrogen Chloride

200100

0.13

30

Volhard Titration with Iodine Solution

6. Hydrogen Sulfide

0.07

30

Methylene Blue

7. Lead

20

30

AASc

8. Nitrogen Dioxide

375,260

0.20,0.14

30,60

Greiss- Saltzman

9. Phenol

100

0.03

30

4-Aminoantiphyrine

10. Sulfur Dioxide

470, 340

0.18, 0.13

30,60

Colorimetric-Pararosaniline

11. Suspended Particulate Matter-TSP

300

----

60

Gravimetric

1 Pertinent ambient standards for Antimony, Arsenic, Cadmium, Asbestos, Nitric Acid and Sulfuric Acid Mists in the 1978 NPCC Rules and Regulations may be considered as guides in determining compliance.

2 Ninety-eight percentile (98%) values of 30-minute sampling measured at 250C and one atmosphere pressure.

3 Other equivalent methods approved by the Department may be used.

The basis in setting up the ambient air quality guideline values and standards shall reflect, among others, the latest scientific knowledge including information on:

a) Variable, including atmospheric conditions, which of themselves or in combination with other factors may alter the effects on public health or welfare of such air pollutant;

b) The other types of air pollutants which may interact with such pollutant to produce an adverse effect on public health or welfare; and

c) The kind and extent of all identifiable effects on public health or welfare which may be expected from presence of such pollutant in the ambient air, in varying quantities.

The Department shall base such ambient air quality standards on World Health Organization (WHO) standards, but shall not be limited to nor be less stringent than such standards.