This short guide on data quality management looks at how cities can process and validate air quality data to ensure its accuracy and precision. It has been designed to support reporting requirements for C40 member cities but will be more widely applicable.The guide focuses on:Quality control: Data validation (such as checking for outliers) and assessment of data completeness.Calculation of summary...

The "Getting Started" page of the HAQAST website covers the following questions:Why use satellite data for air quality monitoring?What can I use satellite data for?How do I get started?Where can I find more resources?...

The U.S. Environmental Protection Agency (EPA) initiated the national PM2.5 Chemical Speciation Monitoring Network (CSN) in 2000 to support evaluation of long-term trends and to better quantify the impact of sources on particulate matter (PM) concentrations in the size range below 2.5 μm aerodynamic diameter (PM2.5; fine particles). The network peaked at more than 260 sites in 2005. In response to...

NCore is a multi pollutant network that integrates several advanced measurement systems for particles, pollutant gases and meteorology. Most NCore stations have been operating since the formal start of the network on January 1, 2011.  The requirements for NCore monitoring can be found in 40 CFR part 58 Appendix D.The NCore Network addresses the following objectives:Timely reporting of data to...

The U.S. air quality trends summaries are intended to reflect actual air quality and therefore include concentrations that may have been impacted by episodic events like wildfires and dust storms.  Air Quality Design Values are used to designate and classify nonattainment areas and intended to reflect air quality that is not impacted by exceptional events. Therefore if concentrations are show...

REal TIme Geospatial Data Viewer (RETIGO) is a free, web-based tool that can be used to explore environmental data that you have collected either stationary or in motion (e.g., air quality sensors added to a bike).RETIGO allows you to add data from nearby air quality and meteorological stations.RETIGO can be used by anyone to explore data that they collected, but it does not move the data from the...

openair is an R package developed for the purpose of analysing air quality data — or more generally atmospheric composition data. The package is extensively used in academia, the public and private sectors. The project was initially funded by the UK Natural Environment Research Council (NERC), with additional funds from the UK Department for Environment Food & Rural Affairs (Defra)....

A number of diffusive samplers that are used for longer-term monitoring of nitrogen dioxide in the European Union were subjected to a review of their use and performance characteristics. The information collected was used to evaluate the capacity of diffusive samplers for monitoring the European Union annual limit value of 40 µg.m-3 and to draft a proposal method for monitoring nitrogen dioxide in...

One of the main challenges for GAW is to balance the needs of global-scale issues, with regional and urban concerns. Another major challenge is how to accomplish the desires to expand GAW monitoring activities to include measurements for each principal climatic zone and each major biome (some 30 global stations), and to add important species to the measurement list at GAW stations (e.g., NMHCs, ae...

In response to the rapid rise of greenhouse gas (GHG) concentrations in the atmosphere and the resulting negative impacts, nations, states, cities, private enterprises and individuals are accelerating GHG emission reduction efforts while meeting the needs of global economic development and equity. The urgency, complexity and economic implications of GHG emission reductions demand strategic investm...