Real Time Ambient Air Quality Status during Diwali Festival in Central , India

In India, festivals are celebrated with lot of enthusiasm and Diwali is the major festival of light. In this festival, houses are illuminated by lights and sky is illuminated by fireworks. These fireworks though create lot of amusement but also pollute the atmosphere in terms of air pollution. The continuous air pollution monitoring was undertaken during Diwali festival (2014) at residential site NEERI, Nagpur. Air quality parameters were compared with CPCB standard. On Diwali day, PM10 and PM2.5 concentration achieve its highest value of 900 μg/m3 and 950 respectively μg/m3. This high concentration is maintained in atmosphere for two days of this festival in atmosphere which is approximately 8 9 times more than that regulatory standard. These particles carry all the components of the cracker including heavy metals, alkali metals, alkaline earth and change the atmosphere with positive and negative ions apart from impaction of sulfur and other acid gases to the atmosphere.


Introduction
Diwali festival is celebrated in winter season around October, November every year.Due to atmospheric inversion & cold climate, the air pollution load is very high as the pollution load is very high and the pollutants tend to settle down due to low dispersion & dilution in the atmosphere.The urban air quality of India is hereby experiencing increased PM 10 concentration.During Diwali festival time, it attains episodic high level in the air quality.The central India which explains land experiences extreme climate during the festival onset of winter is tak-en place which ties to settle the air pollutants thus giving lot of exposure to the pollution.
Nagpur is centrally located city in India where industrial and commercial growth is moderate.The city has a population of 46.53570 lakhs (2011 census).It is a big centre for industry, education and agriculture in Vidarbha region of Maharastra State.The city celebrates Diwali festival in which various types of crackers are burst, which generates lot of air pollution in atmosphere.This may cause episodic rise in PM 10 and PM 2.5 in atmosphere and imparts adverse effect on regional visibility, global climate change and health [1].
Daily Standard for PM 10 and PM 2.5 is 100 µg/m 3 and 60 µg/m 3 respectively [2].In urban areas, the air quality largely varies on localities.The air quality of the city mainly depends upon activity going on the city like industrial activity, construction activity, transport activity etc.
In the present study, we intend to observe the immediate and short term effect of various activities like bursting of fireworks performed during the festival season on the ambient air.The CAAMS (Continuous Ambient Air Quality Monitoring System) was installed in the residential area and real time monitor 13th October to 28th October 2014 at NEERI Nehru Marg residential site (Environment S.A.).

Study Area
Nagpur (21˚15'N, 79˚08'E) is the Capital of Maharashtra in the winter season.The district stretches to almost 9897 sq km.Nagpur is surrounded by plateau rising northward to the Satpura Range, Kanhan and Pench rivers are the two important rivers of the district.It is situated 274.5 m to 652.7 m above sea level and 28% of the town is covered by forest.The city has a typical seasonal monsoon weather which is normally dry.Average relative humidity (RH) is 60%.Annual average temperature ranges from 33.2˚C to 17.1˚C with average annual rain fall 112 mm.The average meteorological parameters during Diwali October 2014 have been monitored by Metrological Department Nagpur (Table 1).

Methodology
To see the impact of bursting of fireworks during Diwali festival on air quality the real time air quality monitoring was carried out at residential site NEERI, Nagpur (Figure 1) [3].In the present study ambient air quality was  Every hour, a small C 14 (Carbon −14 or Krypton 85) element emits a constant source of high-energy electrons (known as beta rays) through a spot of clean filter tape.

Result & Discussion
The study of air quality in residential site Nagpur during pre Diwali, Diwali, post Diwali periods was aimed at comparing the air quality during these periods and to find out whether the air quality (PM 10 & PM 2.5 ) is within the recommended standard.Diwali is the one of the greatest festival in India that attracts many from far and near thereby increasing human activities like fireworks.NEERI, Residential site was selected for measurement of continuous air quality.The avg. concentration of PM 10 and PM 2.5 has been given in Table 2.
The diurnal variation and the concentration built up in linked to population exposure.The AQI (Air Quality Index) index reaches to dangerous limits indicating heavy impact on respiratory organs of exposed population.The hospital admission also projects alarming rise regarding respiratory disorders.
It is observed that PM 10 & PM 2.5 in the early morning hours (4 AM -7 AM) and night hours (9 PM -12 AM) was highest during the festival time (Figures 2-5).During this time most of the exposed populations are sleeping & hence a large impact on their respiration envisages.These values are approximating 8 -9 times more than the CPCB standards of PM 10 & PM 2.5 values during festival period [4]- [9].
The value ranges between 100 -900 µg/m 3 for both PM 10 & PM 2.5 (Figures 6-9).This can be attributed by increase in anthropogenic activity such as bursting of Fireworks, transportation, other ritual activities etc.During 7 AM -9 PM the value of PM 10 & PM 2.5 is relatively less but high as compared to regulatory Standard.The value ranges between 80 -200 µg/m 3 for both PM 10 & PM 2.5 .The episodic increase in the concentration level of fine particulates PM 10 & PM 2.5 reaches the threshold limits for set as 1000 µg/m 3 by USEPA which is lately reduced lately [10].
Though the festive period is the time of lot of capital generation for businessmen by selling crackers and sweets, but providing healthy air common people is big question during festival time.In India the air quality standard for PM 10 and PM 2.5 are specified as 100 µg/m 3 and 60 µg/m 3 respectively [4].It has been observed that extreme air quality has adverse effects on citizens [11]- [13].The increase concentration of particulate matter (PM 10 & PM 2.5 ) leads to increase in the cations concentration in atmosphere which causes serious health hazard [14].Heavy metal characterization is shown in Figure 10 and Figure 11 for PM 10 and PM 2.5 respectively.It has been scientifically proven that particulate matter (PM 10 & PM 2.5 ) more than standard value can cause acute respiratory effect [15] [16].The quality of life of people is well being described by individual's health [17].Health includes physical, psychological and social well being of an individual [18].The statistical tool SPSS is used to analyze the data; correlation coefficient and regression coefficient were performed between pollutants PM 10 and PM 2.5 .The summary of ambient air pollutant is presented in Table 3, Table 4, and Table 5.It has found that ambient air quality in terms of PM 10 and PM 2.5 has drastic change as compared to normal (correlation coefficient = 0.6).Even in the post Diwali the condition of air quality is bad.It is negatively correlated with the normal in day time where as the condition is far better in night time during post Diwali days.
It was observed that linear regression of PM 10 and PM 2.5 has strong relationship during day time (R 2 > 0.9).In the night time PM 10 & PM 2.5 has moderate relationship (R 2 > 0.5).
Diwali festival is generally celebrated in month of October-November.The meteorology of these seasons is falls in calm condition which may have substantial impact on ambient concentration and ambient air quality greatly varies according the local activity such as transport and small scale industry.The dispersion of concentration these pollutants PM 10 & PM 2.5 is depicted in Figure 12 and        plotted by using surfer.The model has assumed the study area as a centre point and plots contours of dispersion of pollutants.This shows that approximate 10 km Area of Nagpur from sampling site.This covers the Mihan, Newkhapri, Gumgaua, Jamthaand and Wagdara etc. (Figure 14).The people of these localities are more affected by these pollutants.

Conclusion
Study of pre Diwali, Diwali, post Diwali has been investigated in residential Area Nagpur.This study has shown the pollution levels in terms of particulate matter which is higher than the normal day and it remains in the atmosphere after the two days of festival.The particulate matter (PM 10 & PM 2.5 ) exceeds the CPCB standard.Though this is time of merriment and income generation, this leads to risk of endangering of health of people.

Figure 2 .
Figure 2. Variation of concentration of PM 10 in day time during Diwali days.

Figure 3 .
Figure 3. Variation of concentration of PM 10 in night time during Diwali days.

Figure 4 .Figure 5 .
Figure 4. Variation of concentration of PM 10 in day time during Diwali days.

Figure 6 .
Figure 6.Diurnal variation of PM 10 during Diwali days.

Figure 9 .
Figure 9.Diurnal variation of PM 2.5 during Diwali days.

Figure 13 .
The dispersion contours has been

Figure 10 .
Figure 10.Heavy metal characterizations in PM 10 during Diwali festival.

Figure 11 .
Figure 11.Heavy metal characterizations in PM 2.5 during Diwali festival.

Figure 12 .
Figure 12.Dispersion of PM 10 across the Nagpur city during Diwali days.

Figure 13 .
Figure 13.Dispersion of PM 2.5 across the Nagpur city during Diwali days.

Figure 14 .
Figure 14.Satellite image of sampling site at Nagpur.

Table 1 .
Climate data during month of October Diwali.
measured by CAAMS for fine particulate matter PM 10 & PM 2.5 .The fine particulate monitor of CAAMS works on principle of Beta Attenuation Method for measuring and analysis of the concentration of PM 10 & PM 2.5 .

Table 2 .
Avg. ambient concentration of PM 10 , PM 2.5 during Diwali seasons.

Table 3 .
Summary of air quality during day times of Diwali days.

Table 4 .
Summary of air quality during night times of Diwali days.

Table 5 .
Summaries of PM 10 & PM 2.5 during Diwali days.