These reports contain real-time continuous data that may not have not been through a quality assurance review. Consider results as unofficial data. Data at individual monitoring stations may be influenced by exceptional events, instrument malfunctions or sampling errors. Examples of exceptional events include grass fires, scheduled burning, or windy and dusty conditions that influence PM 2.5 values for a relatively short time. Sampling errors may occur during routine maintenance if the instrument is disturbed or the measurement inadvertently includes readings from a calibration standard. For reports in the advanced reports menu, the data requests can get too big. If your query returns an error or will not display the page, try reducing the date range, number of parameters, or number of sites requested.