Reuters: Roadside air pollution in Hong Kong hit record highs in the first six months of the year, hurting public health and economic competitiveness compared with Asian rivals, activists and lawmakers said Tuesday. The city’s air quality hit “unhealthy” levels about 10 percent of the time between January and June, the highest level in five years, said environmental group Friends of the Earth. The government advises people with heart or respiratory problems to avoid lingering in …