Code for the Azure serverless function that persists sensor readings

Azure_Persist.cs

using System.Net;

public static HttpResponseMessage Run(HttpRequestMessage req, out object airQualityDocument, TraceWriter log)
{
    string latitude = req.GetQueryNameValuePairs()
        .FirstOrDefault(q => string.Compare(q.Key, "latitude", true) == 0)
        .Value;

    string longitude = req.GetQueryNameValuePairs()
        .FirstOrDefault(q => string.Compare(q.Key, "longitude", true) == 0)
        .Value;

    string ppm = req.GetQueryNameValuePairs()
        .FirstOrDefault(q => string.Compare(q.Key, "ppm", true) == 0)
        .Value;

    airQualityDocument = new {
        Latitude = latitude ,
        Longitude = longitude,
        Ppm = ppm,
        RequestDateTime = DateTime.Now
    };

    return (latitude != string.Empty && longitude != string.Empty && ppm != string.Empty) ? req.CreateResponse(HttpStatusCode.OK) : req.CreateResponse(HttpStatusCode.BadRequest);

}