About one in eight (12.3%) dwellings in Ireland was vacant in 2016.
The Border (22.6%) and the West (18.4%) had the highest vacancy rates while Dublin (6.2%) and the Mid-East (7.3%) had the lowest.
Leitrim (29%), Donegal (27.4%) and Kerry (24%) had the highest vacancy rates in 2016 at county level. The lowest rates were in all in the Dublin region with South Dublin at 3.6%, Fingal at 5% and Dún Laoghaire-Rathdown at 5.5%.
Nationally, 42% of all dwellings were detached houses in 2016. Nearly two-thirds of dwellings in the Border and West regions were detached houses compared to just 11.5% in Dublin.
At county level, more than 70% of dwellings were detached houses in Galway county, Roscommon and Leitrim. In contrast, the proportion of dwellings which were detached was very low in Dublin City (4.9%), South Dublin (10.5%) and Cork city (11.1%).
Apartments accounted for 12% of all dwellings in Ireland in 2016 but this varied from a high of 25.4% in Dublin to 4.3% in the Border.
Over a third (35.2%) of all dwellings in Dublin city and 23.9% in Galway city were apartments in 2016.
The lowest proportions of apartments were 2.5% in Roscommon and 3.6% in Donegal, Tipperary and Offaly.
There were 14,446 new dwellings completed in 2017, compared to 4,911 in 2012.
Nearly six out of every ten new dwellings built in 2017 were in Dublin or the Mid-East region, with 38.8% of all new dwellings in Dublin and 20.4% in the Mid-East.
The counties with the largest number of new dwellings completed in 2017 were Dublin (5,602), Cork (1,402) and Meath (1,108). Less than 100 new dwellings were completed in 2017 in Leitrim, Longford and Carlow.
Three out of every ten new dwellings completed in 2017 were single units, (i.e., separate detached houses). The Midland region had the highest proportion of single houses at 70.1% while Dublin had the lowest at 5.4%.
At county level, just over 80% of all new dwellings built in Laois and Kilkenny were single units.
The average price for new residential dwellings in 2017 was €345,206. The highest regional price was in Dublin at €446,782 with the lowest in the Border at €159,758.
The highest average prices for new dwellings at county level were in Dún Laoghaire-Rathdown at €649,736 followed by Dublin City at €434,365 while the lowest prices were in Leitrim at €130,584 and Cavan at €138,836.
Average prices for existing dwellings in 2017 were lower than for new dwellings, a reversal of the pattern in 2012.
The average price for existing dwellings in 2017 was €259,548 with the highest regional price in Dublin at €424,255 and the lowest in the Border at €127,318.
The highest prices for existing dwellings at county level were in Dún Laoghaire-Rathdown at €585,306 followed by Dublin city at €414,540 while the lowest prices were in Longford at €98,094 and Leitrim at €107,347.
Average prices of new dwellings increased by 12.3% each year between 2012 and 2017 while prices of existing dwellings rose by 4.8% each year.
Westmeath had the highest annual percentage change in new dwelling prices at 14.6% between 2012 and 2017 while there were price decreases in Galway and Tipperary of just over 1% each year over the same time period.
The highest annual percentage change in existing dwelling prices was in Laois at 9.3% while prices decreased in Limerick City by 2.7% each year.
Air quality was monitored at 14 stations across the country during 2017. In Ennis the value of PM10 was greater than 50 μg/m3 on nine days during 2017, while Rathmines exceeded this limit on five days.
The highest daily maximum was in Rathmines at 103 μg/m3 followed by Castlebar at 97.
The highest annual mean value for PM10 during 2017 was the South Link Road in Cork at 17 μg/m3 followed by Ennis at 16, while the lowest annual mean values were Kilkitt at 8 and the Phoenix Park at 9.
The Border region had the highest proportion of household waste collected as mixed residual waste, (i.e., kerbside black bin collection) in 2016 at 57.7%, while the lowest proportion was in the South-West at 44.7%.
The counties with the highest proportion of household waste collected in black bins were Monaghan (65%), Donegal (64%) and Longford (60.8%).
Kerry (34.8%), Fingal (35.1%) and Galway City (35.5%) had the lowest proportion of household waste collected in black bins.
There was a large variation across Ireland in the proportion of household waste collected in kerbside recyclables (i.e., green bin, brown bin and glass) from a high of 40.3% in Galway City to just 9.8% in Westmeath.
There was also a wide range in the proportion of household waste brought to bring banks and civic amenities in 2016, varying from 32.5% in Kerry to 7.1% in Cork City.
There were 558 private cars per 1,000 persons aged 17 and over in Ireland in 2016, an increase of 18 per 1,000 since 2011.
The South-East region (616) had the highest rate of private car registrations per 1,000 people aged 17 and over, while the Dublin region (496) had the lowest.
At county level, the highest rates of private car registrations were in Roscommon (645), Carlow (637) and Wexford (635). The counties with the fewest cars per 1,000 people aged 17 and over were Dublin (496), Louth (522) and Donegal (524).
The private car registration rate increased in all counties between 2011 and 2016.