Air monitoring

Updated on : 01 Mar 2016

Under the National Air Monitoring Programme (NAMP) there are four monitoring stations in Nagaland i.e. two stations at Dimapur and two stations at Kohima. Under this programme three air pollutants are monitored and analyzed viz., Respirable Suspended Particulate Matter (RSPM), Nitrogen dioxide (NO₂) and Sulphur dioxide (SO₂). The monitoring of pollutants is carried out for 24 hours and 8 hourly sampling for particulate matter (RSPM) and 4 hourly sampling for gaseous pollutants (NO₂& SO₂) twice in a week.

The Nagaland Pollution Control Board regularly monitors ambient air quality of Dimapur and Kohima city throughout the year using manually operated Respirable Dust Samplers. The data generated in the NAMP stations are uploaded in the Environmental Air Quality Data Entry System of the Central Pollution Control Board.

The readings and data comparison of Dimapur and Kohima NAMP stations for the year 2014 to 2017 are given in the table below.

STATUS OF AMBIENT AIR QUALITY AT KOHIMA CITY

Monthly average concentration of Respirable Suspended Particulate Matter (RSPM) at two stations viz Opposite N.S.T office (609) and Opposite War Cemetery (610) during 2014 to 2017

Sl. No	Month	Opp. NST office (609)				Opp. War Cemetery (610)
Sl. No	Month	2014	2015	2016	2017	2014	2015	2016	2017
1	January	87	87	102	87	127	127	145	144
2	February	84	84	115	96	131	131	165	147
3	March	88	88	83	109	133	133	158	161
4	April	84	84	59	84	118	118	122	170
5	May	64	64	56	59	122	122	126	136
6	June	42	42	39	49	94	94	88	128
7	July	44	44	28	53	86	86	74	102
8	August	44	44	28	55	74	74	84	108
9	September	50	50	30	48	91	91	84	95
10	October	66	66	38	69	119	119	110	157
11	November	86	86	62	95	122	122	147	203
12	December	109	109	98	142	139	139	147	247
Annual Average		71	71	62	79	113	118	121	150

AMBIENT AIR QUALITY STATUS OF DIMAPUR CITY

Monthly average concentration of Respirable Suspended Particulate Matter (RSPM) at two stations viz. Bank Colony (317) and Dhobinala (448) during 2014 to 2017

Sl. No	Month	Bank Colony (317)				Dhobinala (448)
Sl. No	Month	2014	2015	2016	2017	2014	2015	2016	2017
1	January	221	182	199	189	296	218	207	194
2	February	165	201	158	143	205	218	202	195
3	March	134	163	154	160	218	215	236	245
4	April	133	93	93	141	240	123	135	194
5	May	73	60	84	93	130	110	131	165
6	June	42	46	92	92	82	79	112	99
7	July	36	44	36	77	67	80	74	104
8	August	38	39	49	107	64	83	73	118
9	September	48	51	52	145	69	82	80	122
10	October	101	94	89	141	132	97	105	138
11	November	146	132	145	110	184	192	167	127
12	December	196	201	152	148	214	211	172	136
Annual Average		96	108	109	128	158	142	141	153

The Annual average values for Respirable Suspended Particulate Matter (RSPM) depicted in the table above shows that particulate matter increases during the dry season starting from October to April.

Annual average concentration of Respirable Suspended Particulate Matter in Kohima

Sl.No.	Year	Annual average concentration of RSPM in Kohima (µg/m³)
1	2014	92
2	2015	95
3	2016	92
4	2017	115

Annual average concentration of Respirable Suspended Particulate Matter in Kohima

Sl.No.	Year	Annual average concentration of RSPM in Dimapur (µg/m³)
1	2014	127
2	2015	125
3	2016	125
4	2017	140

Inference:

The analysis for the past 4 years from 2014 – 2017 shows that in both Kohima and Dimapur the concentration of RSPM values had exceeded the prescribed National Ambient Air Quality Standards (NAAQS) of 60 (µg/m³). The Central PollutionControl Board has categorized both Kohima and Dimapur falls under “Non Attainment Cities & Towns” due to high level of RSPM concentration.

NATIONAL AMBIENT AIR QUALITY STANDARDS (2009)

Pollutants	Time weighted average	Concentration in Ambient Air
Pollutants	Time weighted average	Industrial, Residential, Rural and Other Areas	Ecologically Sensitive Area (notified by Central Government)
Sulphur Dioxide (SO₂), µg/m³	Annual *	50	20
Sulphur Dioxide (SO₂), µg/m³	24 hours **	80	80
Nitrogen Dioxide (NO₂), µg/m³	Annual *	40	30
Nitrogen Dioxide (NO₂), µg/m³	24 hours **	80	80
Particulate Matter (Size less than 10µm) or PM₁₀ , µg/m³	Annual *	60	60
Particulate Matter (Size less than 10µm) or PM₁₀ , µg/m³	24 hours **	100	100
Suspended Particulate Matter (SPM), µg/m³	Annual *	140***	70
Suspended Particulate Matter (SPM), µg/m³	24 hours **	200***	100

*	Annual Arithmetic mean of minimum 104 measurements in a year at a particular site taken twice a week 24 hourly at uniform intervals.
**	24 hourly or 8 hourly or 1 hourly monitored values, as applicable, shall be complied with 98 % of the time in a year.2% of the time, they may exceed the limits but not on two consecutive days of monitoring.
*******	The values under industrial area for Suspended Particulate Matter (SPM) is 360 µg/m³ (Annual Average) and 500 µg/m³(24 Hourly)

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