FFig. 6. Hourly wind speed (m s−1 ) and pollutant concentrations (μg m−3 ) during the cold surge (11 Dec. 2003) and in the NRTI period (13 to 17 Dec. 2003).
FFig. 6. Hourly wind speed (m s−1) and pollutant concentrations (μg m−3) during thecold surge (11 Dec. 2003) and in the NRTI period (13 to 17 Dec. 2003).