Question 250 – Data handling and analysis - Questions

An environmental agency investigated the effectiveness of two active filtration strategies for reducing air pollution in urban areas. Strategy 1 was Electrostatic Precipitation (ESP) and Strategy 2 was Bio-Phytoremediation (BPR). A sample of 40 roadside monitoring stations was randomly allocated to receive one of the two strategies. Particulate matter levels $PM2.5\text{PM}_{2.5}$ were measured in micrograms per cubic metre ( $μg/m3\mu\text{g/m}^3$ ) at the start of a 6-month trial and again 6 months post-implementation. Higher values of $PM2.5\text{PM}_{2.5}$ indicate worse air quality (greater pollution severity).

Table 1: Median $PM2.5\text{PM}_{2.5}$ concentrations ( $μg/m3\mu\text{g/m}^3$ ) at the start and 6 months post-implementation

	Median $PM2.5\text{PM}_{2.5}$ concentration for ESP	Median $PM2.5\text{PM}_{2.5}$ concentration for BPR
At the start of the trial	52.4	51.8
6 months post-implementation	18.2	34.5

Table 1: Median $PM2.5\text{PM}_{2.5}$ concentrations ( $μg/m3\mu\text{g/m}^3$ ) at the start and 6 months post-implementation

	Median $PM2.5\text{PM}_{2.5}$ concentration for ESP	Median $PM2.5\text{PM}_{2.5}$ concentration for BPR
At the start of the trial	52.4	51.8
6 months post-implementation	18.2	34.5

Data handling and analysis

Question 94

Table 1: Median $PM2.5\text{PM}_{2.5}$ concentrations ( $μg/m3\mu\text{g/m}^3$ ) at the start and 6 months post-implementation

Data handling and analysis

Question 94

Table 1: Median $PM2.5\text{PM}_{2.5}$ concentrations ( $μg/m3\mu\text{g/m}^3$ ) at the start and 6 months post-implementation

Data handling and analysis

Question 94

Table 1: Median PM2.5\text{PM}_{2.5}PM2.5​ concentrations (μg/m3\mu\text{g/m}^3μg/m3) at the start and 6 months post-implementation

Data handling and analysis Questions

Data handling and analysis

Question 94

Table 1: Median PM2.5\text{PM}_{2.5}PM2.5​ concentrations (μg/m3\mu\text{g/m}^3μg/m3) at the start and 6 months post-implementation

Data handling and analysis Questions

Table 1: Median $PM2.5\text{PM}_{2.5}$ concentrations ( $μg/m3\mu\text{g/m}^3$ ) at the start and 6 months post-implementation

Table 1: Median $PM2.5\text{PM}_{2.5}$ concentrations ( $μg/m3\mu\text{g/m}^3$ ) at the start and 6 months post-implementation