Abstract
Forest fires that occur in Riau Province due to the rampant clearing of forests used as plantation land, such as oil palm plantations have a negative influence on the air quality of the surrounding area, one of them is Lima Puluh Kota. The purpose of this study was to determine the Air Quality Index (AQI ) hierarchically from Sumatra Island, West Sumatra Province, and larger scale in Lima Puluh Kota Regency and analyze changes in the value of AQI in Lima Puluh Kota in the last few years (2014-2017). This research includes quantitative descriptive research with literary study approach and literature then coordinating national AQI values on Sumatra Island and making more detailed observations in West Sumatra Province, and District of Lima Puluh Kota. The spatial analysis uses the interpolation process (IDW Method). The value in the analysis refers to the prevailing AQI value. The results of the study were fluctuating changes in Sumatra Island AQI values, in 2014 had an average score of AQI 86,796, down in 2017 with an average value of 84,295, after cases and environmental phenomena on the island of Sumatra in the period of 2014-2015, the average AQI value in 2016 dropped to 81.24, in 2017 there have been environmental improvements, this is illustrated by the increase in AQI to 90.471 on the average provincial AQI on Sumatra Island. Positive correlation occurs between the increase and decrease in the value of AQI on the scale of Sumatra Island with concentrations of PM10, SO2, CO and NO2 in the District of Lima Puluh Kota.
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