Temporal variations of ambient air pollutants and meteorological influences on their concentrations in Tehran during 2012-2017.

摘要: We investigated temporal variations of ambient air pollutants and the influences meteorological parameters on their concentrations using a robust method; convergent cross mapping; in Tehran (2012–2017). citizens were consistently exposed to annual PM2.5, PM10 NO2 approximately 3.0–4.5, 3.5–4.5 1.5–2.5 times higher than World Health Organization quality guideline levels during period. Except for O3, all demonstrated lowest highest summertime wintertime, respectively. The O3 found weekend (weekend effect), whereas other had statistically significant (P < 0.05) daily which observed weekdays compared (holiday effect). Hourly concentration reached its peak at 3.00 p.m., though displayed two peaks; morning late night. Approximately 45% 65% AQI values subcategory unhealthy sensitive groups PM2.5 was responsible pollutant Tehran. Amongst factors, temperature key influencing factor concentrations, while nebulosity solar radiation exerted major SO2 concentrations. Additionally, there is moderate coupling between wind speed CO