async Task <float> CalculatePollution(List <Position> pollutionPoints, bool main = false)
        {
            float overall = 0, max = 0;

            if (pollutionPoints.Count > 0)
            {
                List <List <string> > list = new List <List <string> >();
                for (int i = 0; i < pollutionPoints.Count; i++)
                {
                    List <string> point = new List <string>();
                    point.Add(pollutionPoints[i].Latitude.ToString("F6"));
                    point.Add(pollutionPoints[i].Longitude.ToString("F6"));
                    list.Add(point);
                }
                PollutionRequest request = new PollutionRequest()
                {
                    RAD   = 50,
                    PAIRS = list
                };
                var result = await rest.GetPollution(JsonConvert.SerializeObject(request));

                if (result != null)
                {
                    int maxIndex = 0;
                    if (result.val.Count >= 5)
                    {
                        for (int index = 2; index < result.val.Count - 2; index++)
                        {
                            float subTotal = 0;
                            for (int j = index - 2; j < index + 2; j++)
                            {
                                subTotal += (float)Convert.ToDouble(result.val[j]);
                            }
                            if (subTotal > max)
                            {
                                max      = subTotal;
                                maxIndex = index;
                                peak     = max;
                            }

                            overall += (float)Convert.ToDouble(result.val[index]);
                        }
                        overall /= result.val.Count;
                        double lat, lng;
                        lat     = Convert.ToDouble(result.lat[maxIndex]);
                        lng     = Convert.ToDouble(result.lon[maxIndex]);
                        hotspot = new Position(lat, lng);
                    }
                }
            }

            return(overall);
        }