Air pollution is rapidly increasing in metropolitan cities in India. Maintaining good Air quality is becomes the biggest challenge in present era. The presence or absence of various substance and their concentrations are the main determining factors of air quality. Air quality is expressed as a concentration or intensity of contaminants. Pollutants like dust particulate, sulphur dioxide, oxides of carbon, nitrogen etc. are the key indicators of urban air pollution these pollutants when present in large quantities in the atmosphere it diorites the quality of air and pose health problems in human beings. The central and state pollution control boards are constantly monitoring air quality in many identified areas of major cities of India, Air quality monitoring data clearly showed comparatively lower concentration of gaseous pollutants (SO₂, NOᵪ) and higher concentration of SPM and RPM in the ambient air in the (Chauhan P., 2015). India need to generate regular information on the ambient concentration levels of small particulates of diameter less than 10 micron and/or 2.5 micron and take urgent steps to control emissions of these particles (Hosamane S. N. and Dr. Desai G. P., 2018) present research work is to constantly monitor ambient air quality in eco sensitive zone of Bangalore which is located Jananabarathi campus, Bangalore University. The ambient air quality is continuously monitored from 2010. The objective is creating decade data base of ambient air quality and monitor the changes in the ambient air quality.

The study area is Department Environmental Science Jnana Bharthi Campus of Bangalore University, Bangalore. is located at the latitude of 12.946259 N and longitude of 77.510770 E. Located. It is an isolated serene place with an area of 486 ha and has a diverse habitats consisting of mixed deciduous and non-deciduous trees, shrubs, clumps of bamboos, marshes, check dams mini parks and Bio park that has developed in the campus in the year 2000 and about two lakh saplings of different plants species were planted. The air quality monitoring is carried out by standard method prescribed by CPCB. Yearly 104 days sampling is carried out for Suspended particulate matter, Repairable particulate matter, oxides of Sulphur and oxides of nitrogen in air. To determine concentration of particulate matter gravimetric method is followed and to determine oxide of Sulphur Modified West and Geake Method Sodium-Arsenite method (National ambient air quality monitoring Series: naaqms/ ... /2003-04 )

The results indicate that air quality at J. B Campus, Bangalore University is well within permissible limit but decadal statistical analysis has shown gradual increase in pollutant concentration. Significant increase is observed 2014.

Figure 1

Table 1

Year	Average SO2 µg/m3	Average NO2 µg/m3	Average RSPM µg/m3	Average SPM µg/m3
2010	4.6	16.2	44.1	65.9
2011	8.1	18.3	41.9	56.8
2012	6.6	17.2	40.6	56.1
2013	8.2	18.4	42.2	56.5
2014	7.7	15.4	47.1	69.0
2015	5.3	16.8	42.1	63.9
2016	4.4	15.3	40.2	61.3
2017	4.6	11.2	25.9	39.5
2018	4.1	14.2	37.7	55.2

The statistical analysis clearly indicates the gradual Increase in air pollutant concentration in eco-sensitive area which is surrounded by luxuriant growth of different tree species. Results show annual continual increase from 2010 to 2018. This study will help in understanding assimilative capacity of green cover by proxy values. The level of pollution in city due to point and nonpoint sources is increasing in exponentially, as a result having impact on the Bangalore university bio park an eco-sensitive zone. The result has shown an average increase of 2µg/m³ of oxides of sulfur, 4µg/m³ of 10µg/ m³ of suspended particulate matter respectively. The seasonal levels of particulate matter and oxides of sulfur have shown slight increase in levels during summer and Oxides of Nitrogen levels are high during monsoon season.