MASSACHUSETTS
For 1999 and after, click
on the date for the corresponding eight-hour average peak ozone
map for that day.
In March 2008, EPA revised the 8-hour ozone standard and changed the Air Quality Index (AQI)
to align with this new standard. Maps for days in 2007 and earlier are based on the 1997
8-hour ozone standard. Maps for 2008 are based on the new 2008 ozone standard and the revised
AQI. Click Here
for a table showing the revised AQI breakpoints for the 2008 ozone standard.
ADAMS | AGAWAM | AMHERST |BLUE HILL | BOSTON - LONG ISLAND | CHELMSFORD | CHELSEA | CHICOPEE | EASTON | NORTH EASTON | FAIRHAVEN | HAVERHILL | LAWRENCE | LYNN | MARTHA'S VINEYARD | NEWBURY | SCITUATE | STOW | SUDBURY | TRURO | WALTHAM | WARE | WORCESTER
ADAMSOperating from 1995 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 0 | 2 | 0.079 | May 31 | 0.078 | Aug 4 | 0.074 | May 30 | 0.074 | Aug 9 |
1995 | 0 | 2 | 0.083 | June 18 | 0.077 | Aug 1 | 0.073 | June 19 | 0.072 | June 29 |
1996 | 2 | 6 | 0.096 | June 7 | 0.085 | Aug 7 | 0.084 | June 2 | 0.081 | June 1 |
1997* | 1 | 5 | 0.090 | June 30 | 0.084 | July 13 | 0.082 | July 14 | 0.078 | June 12 |
1998* | 0 | 1 | 0.076 | May 29 | 0.074 | July 14 | 0.073 | Sept 15 | 0.069 | Sept 14 |
1999 | 1 | 3 | 0.086 | May 31 | 0.083 | June 1 | 0.080 | July 16 | 0.075 | June 24 |
2000* | 1 | 2 | 0.090 | June 10 | 0.078 | June 11 | 0.075 | May 6 | 0.072 | June 9 |
2001 | 16 | 26 | 0.108 | June 19 | 0.099 | June 20 | 0.093 | May 4 | 0.092 | June 14 |
2002 | 4 | 10 | 0.101 | Aug 14 | 0.096 | Aug 13 | 0.091 | Aug 12 | 0.086 | Aug 11 |
2003 | 2 | 8 | 0.104 | June 26 | 0.100 | June 25 | 0.083 | June 27 | 0.083 | July 2 |
2004 | 1 | 2 | 0.086 | July 22 | 0.081 | June 24 | 0.075 | Aug 10 | 0.071 | July 1 |
2005 | 6 | 11 | 0.091 | June 9 | 0.089 | Sept 13 | 0.087 | June 24 | 0.087 | June 25 |
2006 | 0 | 4 | 0.082 | June 18 | 0.079 | June 19 | 0.077 | Aug 14 | 0.076 | June 17 |
2007 | 2 | 11 | 0.093 | June 8 | 0.086 | May 25 | 0.082 | May 24 | 0.080 | Sept 7 |
2008 | 2 | 2 | 0.100 | June 13 | 0.092 | June 14 | 0.075 | July 12 | 0.072 | May 26 |
AGAWAMOperating from 1982 to 2002 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 8 | 14 | 0.103 | July 20 | 0.100 | Aug 4 | 0.090 | Aug 25 | 0.089 | Aug 1 |
1995 | 6 | 14 | 0.109 | July 13 | 0.096 | June 30 | 0.096 | Sept 7 | 0.093 | July 4 |
1996 | 2 | 5 | 0.087 | Aug 8 | 0.085 | July 8 | 0.084 | Aug 7 | 0.082 | July 12 |
1997 | 9 | 11 | 0.097 | July 1 | 0.094 | Aug 11 | 0.093 | June 21 | 0.092 | July 25 |
1998 | 1 | 5 | 0.093 | Aug 24 | 0.082 | July 14 | 0.081 | July 16 | 0.080 | July 15 |
1999 | 1 | 8 | 0.088 | June 1 | 0.084 | May 31 | 0.083 | July 30 | 0.081 | Aug 17 |
2000 | 1 | 2 | 0.089 | June 10 | 0.080 | June 16 | 0.073 | June 26 | 0.071 | June 2 |
2001 | 2 | 7 | 0.091 | June 19 | 0.086 | July 23 | 0.082 | July 22 | 0.081 | June 20 |
2002 | 6 | 13 | 0.118 | Aug 14 | 0.112 | Aug 13 | 0.101 | Aug 12 | 0.097 | July 22 |
AMHERSTOperating from 1988 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 7 | 12 | 0.097 | July 9 | 0.097 | Aug 4 | 0.096 | June 17 | 0.091 | July 20 |
1995 | 3 | 7 | 0.089 | Aug 31 | 0.085 | Sept 7 | 0.085 | June 30 | 0.084 | July 28 |
1996 | 3 | 7 | 0.087 | July 12 | 0.086 | Aug 8 | 0.085 | July 8 | 0.081 | Aug 7 |
1997 | 2 | 7 | 0.098 | July 1 | 0.092 | Aug 11 | 0.083 | July 27 | 0.082 | Aug 10 |
1998 | 2 | 8 | 0.100 | July 14 | 0.096 | July 16 | 0.083 | July 27 | 0.081 | July 28 |
1999 | 3 | 10 | 0.098 | July 31 | 0.089 | June 1 | 0.085 | June 27 | 0.084 | May 31 |
2000 | 1 | 2 | 0.086 | June 10 | 0.082 | June 16 | 0.066 | June 25 | 0.065 | June 1 |
2001 | 3 | 10 | 0.102 | June 19 | 0.086 | June 20 | 0.085 | June 13 | 0.084 | May 4 |
2002 | 4 | 8 | 0.107 | Aug 14 | 0.096 | Aug 13 | 0.091 | July 22 | 0.086 | June 21 |
2003 | 0 | 0 | 0.069 | June 29 | 0.066 | April 16 | 0.061 | June 27 | 0.061 | July 24 |
2004 | 1 | 3 | 0.088 | July 22 | 0.079 | Aug 10 | 0.076 | June 24 | 0.062 | June 8 |
2005 | 1 | 5 | 0.092 | June 9 | 0.079 | June 25 | 0.078 | April 20 | 0.078 | June 8 |
2006 | 1 | 2 | 0.102 | June 19 | 0.078 | July 27 | 0.075 | July 10 | 0.074 | Aug 14 |
2007 | 3 | 9 | 0.094 | July 10 | 0.091 | July 9 | 0.087 | Aug 30 | 0.080 | June 19 |
2008 | 0 | 1 | 0.078 | April 19 | 0.074 | April 18 | 0.073 | May 30 | 0.070 | April 23 |
BLUE HILLOperating from 2002 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
2002 | 17 | 32 | 0.134 | Aug 13 | 0.116 | Aug 12 | 0.112 | Aug 14 | 0.107 | Sept 9 |
2003 | 5 | 7 | 0.109 | June 27 | 0.091 | June 26 | 0.090 | June 25 | 0.089 | Aug 22 |
2004 | 2 | 6 | 0.100 | June 8 | 0.095 | June 17 | 0.084 | July 30 | 0.078 | June 9 |
2005 | 4 | 15 | 0.103 | June 25 | 0.091 | June 24 | 0.090 | April 20 | 0.089 | June 26 |
2006 | 2 | 7 | 0.087 | July 18 | 0.086 | June 18 | 0.084 | June 19 | 0.083 | July 2 |
2007 | 7 | 14 | 0.095 | July 26 | 0.095 | Aug 3 | 0.094 | May 25 | 0.088 | Aug 30 |
2008 | 0 | 4 | 0.082 | June 10 | 0.078 | June 14 | 0.077 | July 19 | 0.076 | April 23 |
BOSTON - LONG ISLANDOperating from 1999 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1999 | 4 | 10 | 0.102 | July 16 | 0.100 | June 24 | 0.089 | June 1 | 0.087 | May 31 |
2000 | 0 | 1 | 0.084 | June 10 | 0.073 | June 1 | 0.072 | Aug 9 | 0.070 | June 2 |
2001 | 9 | 13 | 0.111 | June 20 | 0.107 | June 19 | 0.100 | Aug 2 | 0.094 | July 24 |
2002 | 10 | 18 | 0.126 | Aug 13 | 0.117 | Aug 14 | 0.102 | July 3 | 0.102 | Sept 9 |
2003 | 1 | 4 | 0.102 | June 27 | 0.083 | June 25 | 0.078 | June 26 | 0.078 | July 4 |
2004 | 1 | 5 | 0.094 | June 8 | 0.081 | July 22 | 0.080 | July 23 | 0.079 | July 30 |
2005 | 5 | 9 | 0.095 | June 25 | 0.091 | June 26 | 0.089 | Aug 11 | 0.086 | June 24 |
2006 | 0 | 5 | 0.083 | June 22 | 0.083 | July 2 | 0.083 | July 18 | 0.079 | July 1 |
2007 | 0 | 3 | 0.082 | Sept 25 | 0.080 | April 23 | 0.076 | Sept 26 | 0.073 | Aug 3 |
2008 | 0 | 1 | 0.083 | June 10 | 0.073 | July 3 | 0.072 | July 26 | 0.072 | July 18 |
CHELMSFORDOperating from 2005 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
2005 | 2 | 8 | 0.095 | June 27 | 0.085 | June 25 | 0.080 | April 20 | 0.079 | June 24 |
2006 | 0 | 2 | 0.083 | June 19 | 0.077 | June 22 | 0.073 | Mar 31 | 0.071 | June 18 |
2007 | 5 | 9 | 0.095 | Aug 30 | 0.091 | Aug 3 | 0.089 | May 25 | 0.087 | June 27 |
2008 | 0 | 1 | 0.079 | July 3 | 0.071 | July 8 | 0.071 | April 23 | 0.068 | June 3 |
CHELSEAOperating from 1984 to 1999 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 3 | 3 | 0.089 | June 18 | 0.086 | June 17 | 0.086 | Aug 9 | 0.074 | July 19 |
1995 | 1 | 9 | 0.101 | Aug 1 | 0.084 | July 13 | 0.083 | June 30 | 0.083 | Aug 10 |
1996 | 0 | 0 | 0.075 | July 12 | 0.073 | Aug 9 | 0.072 | Aug 7 | 0.071 | Aug 6 |
1997 | 2 | 3 | 0.086 | June 30 | 0.085 | Aug 10 | 0.081 | June 21 | 0.075 | June 12 |
1998 | 4 | 7 | 0.095 | Aug 24 | 0.088 | May 29 | 0.088 | July 14 | 0.087 | July 15 |
1999 | 3 | 8 | 0.102 | July 16 | 0.093 | July 17 | 0.089 | June 24 | 0.084 | May 31 |
CHICOPEEOperating from 1983 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 8 | 17 | 0.102 | Aug 4 | 0.102 | July 20 | 0.097 | June 17 | 0.095 | Aug 1 |
1995 | 8 | 17 | 0.101 | July 13 | 0.100 | June 30 | 0.095 | July 4 | 0.093 | July 28 |
1996 | 3 | 6 | 0.094 | July 8 | 0.094 | Aug 7 | 0.087 | Aug 8 | 0.082 | July 12 |
1997 | 7 | 10 | 0.104 | July 1 | 0.097 | Aug 11 | 0.095 | June 21 | 0.092 | July 27 |
1998 | 5 | 14 | 0.104 | July 16 | 0.102 | July 14 | 0.097 | July 15 | 0.093 | Aug 24 |
1999 | 7 | 15 | 0.095 | June 1 | 0.093 | July 30 | 0.089 | July 16 | 0.088 | June 27 |
2000 | 1 | 4 | 0.090 | June 10 | 0.084 | June 16 | 0.084 | June 26 | 0.079 | June 2 |
2001 | 9 | 18 | 0.105 | June 19 | 0.098 | June 20 | 0.097 | May 4 | 0.090 | May 2 |
2002 | 10 | 20 | 0.118 | Aug 14 | 0.115 | Aug 12 | 0.108 | July 22 | 0.108 | Aug 13 |
2003 | 3 | 8 | 0.099 | June 25 | 0.093 | June 29 | 0.089 | June 27 | 0.084 | June 26 |
2004 | 1 | 4 | 0.093 | July 22 | 0.083 | Aug 10 | 0.080 | June 24 | 0.078 | May 15 |
2005 | 8 | 15 | 0.104 | June 9 | 0.098 | Aug 12 | 0.095 | June 26 | 0.090 | June 25 |
2006 | 5 | 11 | 0.119 | June 19 | 0.102 | June 18 | 0.091 | June 22 | 0.090 | July 27 |
2007 | 8 | 18 | 0.112 | July 9 | 0.109 | July 10 | 0.102 | Aug 3 | 0.098 | Aug 30 |
2008 | 2 | 6 | 0.086 | June 10 | 0.085 | June 28 | 0.080 | July 26 | 0.078 | April 19 |
EASTONOperating from 1996 to 2001 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1996 | 3 | 8 | 0.094 | July 6 | 0.087 | Aug 7 | 0.085 | Aug 23 | 0.084 | June 17 |
1997 | 7 | 13 | 0.096 | June 30 | 0.095 | June 12 | 0.094 | July 17 | 0.093 | June 21 |
1998 | 7 | 11 | 0.105 | Aug 24 | 0.091 | July 15 | 0.090 | Sept 6 | 0.088 | Sept 27 |
1999 | 3 | 8 | 0.091 | June 24 | 0.089 | July 16 | 0.086 | July 17 | 0.083 | July 15 |
2000 | 0 | 2 | 0.081 | May 7 | 0.077 | July 3 | 0.074 | June 9 | 0.072 | June 10 |
2001 | 14 | 25 | 0.107 | Aug 2 | 0.103 | Aug 9 | 0.101 | June 20 | 0.098 | June 19 |
NORTH EASTONOperating from 1982 to 1996 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 8 | 16 | 0.103 | Aug 9 | 0.102 | June 18 | 0.098 | July 13 | 0.098 | July 20 |
1995 | 10 | 20 | 0.108 | Aug 1 | 0.108 | Aug 2 | 0.106 | Aug 10 | 0.104 | July 14 |
1996 | 1 | 3 | 0.085 | July 6 | 0.078 | June 17 | 0.076 | Aug 7 | 0.075 | Aug 23 |
FAIRHAVENOperating from 1982 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 1 | 4 | 0.098 | July 13 | 0.080 | Aug 4 | 0.080 | Aug 28 | 0.077 | July 12 |
1995 | 9 | 14 | 0.125 | June 19 | 0.124 | Aug 21 | 0.107 | June 18 | 0.107 | July 14 |
1996 | 6 | 14 | 0.113 | July 18 | 0.104 | June 14 | 0.092 | May 20 | 0.092 | July 6 |
1997 | 12 | 18 | 0.107 | July 14 | 0.106 | July 17 | 0.103 | Aug 2 | 0.092 | Aug 3 |
1998 | 2 | 12 | 0.099 | Sept 6 | 0.087 | May 28 | 0.084 | Aug 4 | 0.083 | Aug 3 |
1999 | 8 | 14 | 0.112 | July 16 | 0.109 | June 7 | 0.101 | June 23 | 0.098 | July 6 |
2000 | 3 | 8 | 0.105 | June 10 | 0.090 | July 2 | 0.085 | Aug 8 | 0.082 | May 7 |
2001 | 8 | 16 | 0.117 | Aug 7 | 0.113 | Aug 9 | 0.109 | May 4 | 0.101 | Aug 2 |
2002 | 5 | 15 | 0.105 | July 2 | 0.102 | July 18 | 0.087 | July 1 | 0.087 | July 3 |
2003 | 8 | 15 | 0.117 | June 27 | 0.101 | Aug 16 | 0.100 | June 26 | 0.098 | June 25 |
2004 | 1 | 7 | 0.099 | June 9 | 0.084 | June 8 | 0.082 | May 11 | 0.080 | July 4 |
2005 | 1 | 9 | 0.086 | Aug 11 | 0.084 | April 20 | 0.084 | Aug 2 | 0.082 | June 8 |
2006 | 4 | 8 | 0.107 | July 18 | 0.104 | Aug 1 | 0.093 | Aug 2 | 0.085 | July 17 |
2007 | 1 | 3 | 0.086 | May 25 | 0.083 | July 8 | 0.082 | Aug 2 | 0.075 | June 28 |
2008 | 2 | 4 | 0.088 | July 18 | 0.085 | July 17 | 0.082 | July 19 | 0.080 | June 10 |
HAVERHILLOperating from 2004 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
2004 | 1 | 3 | 0.091 | July 22 | 0.078 | July 23 | 0.078 | July 30 | 0.072 | Aug 10 |
2005 | 0 | 4 | 0.084 | Sept 14 | 0.079 | June 25 | 0.079 | July 26 | 0.078 | June 24 |
2006 | 1 | 2 | 0.089 | June 19 | 0.081 | June 22 | 0.075 | July 25 | 0.075 | July 26 |
2007 | 6 | 11 | 0.096 | Aug 3 | 0.095 | Aug 30 | 0.092 | May 25 | 0.090 | June 27 |
2008 | 1 | 3 | 0.093 | June 10 | 0.084 | July 3 | 0.083 | July 8 | 0.073 | April 23 |
LAWRENCEOperating from 1982 to 2002 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 2 | 5 | 0.096 | June 18 | 0.087 | July 21 | 0.084 | Aug 9 | 0.082 | July 20 |
1995 | 0 | 1 | 0.077 | July 13 | 0.074 | Aug 9 | 0.071 | June 30 | 0.069 | July 5 |
1996 | 1 | 7 | 0.085 | Aug 8 | 0.081 | July 12 | 0.080 | Aug 4 | 0.079 | June 2 |
1997 | 2 | 4 | 0.108 | July 1 | 0.088 | Aug 11 | 0.081 | Aug 10 | 0.078 | July 27 |
1998 | 1 | 4 | 0.088 | Aug 24 | 0.081 | July 16 | 0.077 | July 14 | 0.076 | May 29 |
1999 | 1 | 2 | 0.088 | June 1 | 0.083 | May 31 | 0.075 | June 2 | 0.068 | June 6 |
2000 | 0 | 0 | 0.067 | June 16 | 0.062 | June 10 | 0.062 | May 4 | 0.060 | Aug 9 |
2001 | 0 | 0 | 0.073 | June 19 | 0.066 | June 20 | 0.063 | June 14 | 0.062 | July 24 |
2002 | 6 | 13 | 0.109 | Aug 12 | 0.105 | Aug 13 | 0.102 | Aug 14 | 0.088 | June 21 |
LYNNOperating from 1993 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 6 | 14 | 0.097 | June 17 | 0.096 | June 18 | 0.094 | July 21 | 0.090 | Aug 9 |
1995 | 7 | 17 | 0.116 | Aug 1 | 0.100 | July 13 | 0.098 | Aug 10 | 0.094 | June 30 |
1996 | 2 | 9 | 0.091 | Aug 9 | 0.085 | Aug 23 | 0.083 | July 8 | 0.083 | Aug 7 |
1997 | 6 | 11 | 0.104 | July 1 | 0.096 | June 30 | 0.093 | June 21 | 0.091 | Aug 10 |
1998 | 7 | 11 | 0.108 | Aug 24 | 0.105 | July 15 | 0.103 | May 29 | 0.100 | July 14 |
1999 | 6 | 14 | 0.109 | July 16 | 0.101 | June 24 | 0.096 | July 17 | 0.088 | May 31 |
2000 | 1 | 1 | 0.089 | June 10 | 0.073 | June 1 | 0.073 | July 3 | 0.070 | Aug 9 |
2001 | 11 | 17 | 0.111 | June 20 | 0.102 | Aug 2 | 0.101 | July 24 | 0.100 | July 23 |
2002 | 13 | 25 | 0.123 | Aug 13 | 0.122 | Aug 14 | 0.109 | June 26 | 0.100 | July 9 |
2003 | 3 | 6 | 0.100 | June 27 | 0.092 | Aug 22 | 0.088 | June 25 | 0.079 | June 26 |
2004 | 2 | 6 | 0.092 | June 8 | 0.088 | July 30 | 0.083 | July 23 | 0.083 | Aug 3 |
2005 | 6 | 11 | 0.099 | June 25 | 0.096 | June 26 | 0.094 | June 24 | 0.088 | July 26 |
2006 | 1 | 5 | 0.086 | June 19 | 0.084 | June 18 | 0.079 | June 22 | 0.078 | July 18 |
2007 | 4 | 13 | 0.103 | Aug 3 | 0.102 | July 26 | 0.093 | May 25 | 0.088 | June 27 |
2008 | 1 | 5 | 0.086 | July 18 | 0.081 | June 10 | 0.079 | July 3 | 0.078 | July 8 |
MARTHA'S VINEYARDOperating from 2004 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
2004 | 0 | 1 | 0.078 | July 4 | 0.074 | June 23 | 0.074 | July 22 | 0.072 | June 30 |
2005 | 4 | 11 | 0.106 | Aug 11 | 0.104 | Aug 2 | 0.088 | Sept 12 | 0.087 | June 5 |
2006 | 4 | 6 | 0.112 | Aug 1 | 0.112 | Aug 2 | 0.101 | Aug 3 | 0.089 | July 29 |
2007 | 3 | 4 | 0.094 | May 26 | 0.091 | May 25 | 0.088 | June 17 | 0.077 | April 23 |
2008 | 3 | 4 | 0.101 | June 9 | 0.100 | July 29 | 0.087 | July 17 | 0.083 | June 10 |
NEWBURYOperating from 1994 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 0 | 4 | 0.084 | Aug 26 | 0.084 | Aug 28 | 0.082 | Aug 25 | 0.077 | Sept 17 |
1995 | 3 | 8 | 0.101 | Aug 10 | 0.098 | June 30 | 0.092 | Aug 1 | 0.083 | July 5 |
1996 | 2 | 8 | 0.087 | Aug 6 | 0.085 | July 8 | 0.084 | Aug 8 | 0.083 | July 12 |
1997 | 6 | 9 | 0.106 | June 30 | 0.104 | July 1 | 0.087 | June 21 | 0.087 | July 27 |
1998 | 6 | 7 | 0.103 | May 29 | 0.096 | July 16 | 0.096 | Aug 5 | 0.089 | July 14 |
1999 | 6 | 9 | 0.112 | July 16 | 0.108 | June 24 | 0.089 | May 31 | 0.087 | July 23 |
2000 | 0 | 1 | 0.082 | June 1 | 0.074 | July 2 | 0.074 | July 3 | 0.071 | June 21 |
2001 | 8 | 16 | 0.117 | June 20 | 0.099 | June 19 | 0.095 | June 15 | 0.093 | July 24 |
2002 | 9 | 18 | 0.126 | Aug 14 | 0.120 | Aug 13 | 0.103 | Aug 12 | 0.094 | June 21 |
2003 | 2 | 7 | 0.099 | June 27 | 0.092 | June 25 | 0.082 | April 15 | 0.080 | Aug 22 |
2004 | 1 | 5 | 0.085 | July 30 | 0.084 | July 23 | 0.079 | Aug 3 | 0.077 | June 8 |
2005 | 0 | 5 | 0.083 | July 22 | 0.082 | June 26 | 0.079 | April 20 | 0.078 | Aug 8 |
2006 | 1 | 3 | 0.086 | June 19 | 0.082 | June 18 | 0.078 | June 22 | 0.075 | July 15 |
2007 | 4 | 9 | 0.097 | Aug 3 | 0.094 | July 26 | 0.086 | May 25 | 0.086 | Sept 7 |
2008 | 1 | 3 | 0.085 | July 18 | 0.080 | June 10 | 0.077 | July 26 | 0.075 | July 3 |
SCITUATEOperating from 1987 to 1997 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 2 | 6 | 0.088 | July 13 | 0.087 | Aug 9 | 0.082 | July 20 | 0.082 | July 21 |
1995 | 1 | 4 | 0.089 | Aug 1 | 0.084 | June 18 | 0.084 | July 14 | 0.081 | Aug 10 |
1996 | 0 | 0 | 0.073 | July 6 | 0.067 | Aug 6 | 0.064 | Sept 4 | 0.063 | July 16 |
1997 | 1 | 3 | 0.088 | July 14 | 0.080 | June 30 | 0.080 | July 1 | 0.071 | July 17 |
STOWOperating from 1998 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1998 | 5 | 8 | 0.109 | May 29 | 0.098 | Aug 24 | 0.090 | July 14 | 0.090 | July 15 |
1999 | 8 | 14 | 0.096 | July 16 | 0.095 | Aug 17 | 0.094 | July 30 | 0.093 | June 1 |
2000 | 1 | 2 | 0.099 | June 10 | 0.077 | June 2 | 0.075 | May 7 | 0.073 | July 13 |
2001 | 12 | 17 | 0.105 | June 19 | 0.101 | July 23 | 0.101 | July 24 | 0.098 | June 20 |
2002 | 8 | 16 | 0.110 | Aug 13 | 0.107 | Aug 12 | 0.106 | Aug 14 | 0.096 | June 26 |
2003 | 0 | 3 | 0.083 | June 27 | 0.079 | June 26 | 0.077 | June 24 | 0.073 | June 29 |
2004 | 1 | 1 | 0.085 | June 8 | 0.075 | July 22 | 0.071 | July 23 | 0.070 | June 24 |
2005 | 2 | 5 | 0.091 | June 25 | 0.087 | June 24 | 0.084 | July 26 | 0.083 | April 20 |
2006 | 0 | 3 | 0.084 | June 18 | 0.083 | June 19 | 0.076 | June 22 | 0.075 | May 25 |
2007 | 5 | 10 | 0.091 | Aug 3 | 0.091 | Aug 30 | 0.086 | May 25 | 0.086 | Sept 7 |
2008 | 1 | 3 | 0.090 | June 14 | 0.076 | July 3 | 0.076 | June 10 | 0.074 | July 8 |
SUDBURYOperating from 1982 to 1998 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 7 | 15 | 0.111 | Aug 9 | 0.099 | July 20 | 0.096 | July 21 | 0.093 | Aug 4 |
1995 | 8 | 16 | 0.111 | Aug 1 | 0.094 | June 30 | 0.092 | July 13 | 0.091 | Sept 7 |
1996 | 2 | 7 | 0.090 | July 12 | 0.090 | Aug 7 | 0.084 | Aug 8 | 0.084 | Aug 9 |
1997 | 6 | 10 | 0.106 | July 1 | 0.094 | June 30 | 0.090 | June 12 | 0.088 | June 21 |
1998 | 4 | 8 | 0.104 | Aug 24 | 0.091 | May 29 | 0.086 | July 14 | 0.085 | July 15 |
TRUROOperating from 1987 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 4 | 11 | 0.096 | July 13 | 0.092 | Aug 4 | 0.090 | Aug 28 | 0.088 | Aug 1 |
1995 | 9 | 16 | 0.125 | June 19 | 0.122 | July 14 | 0.122 | Aug 21 | 0.105 | June 18 |
1996 | 8 | 15 | 0.110 | May 21 | 0.106 | June 14 | 0.100 | July 6 | 0.096 | Aug 7 |
1997* | 17 | 24 | 0.110 | Aug 2 | 0.106 | June 30 | 0.104 | June 12 | 0.100 | June 11 |
1998 | 2 | 10 | 0.110 | Sept 2 | 0.086 | May 28 | 0.084 | Aug 5 | 0.084 | Sept 12 |
1999 | 12 | 19 | 0.116 | June 7 | 0.115 | July 16 | 0.104 | July 17 | 0.101 | June 24 |
2000 | 3 | 10 | 0.126 | June 10 | 0.094 | June 9 | 0.091 | Aug 8 | 0.083 | July 2 |
2001 | 13 | 15 | 0.124 | Aug 7 | 0.113 | May 4 | 0.108 | Aug 9 | 0.105 | Aug 2 |
2002 | 9 | 17 | 0.112 | Aug 13 | 0.105 | July 2 | 0.105 | July 18 | 0.093 | Aug 14 |
2003 | 8 | 16 | 0.110 | June 27 | 0.094 | June 25 | 0.094 | July 5 | 0.089 | Aug 16 |
2004 | 3 | 6 | 0.107 | June 9 | 0.089 | June 8 | 0.085 | May 11 | 0.083 | July 30 |
2005 | 7 | 15 | 0.095 | Aug 11 | 0.094 | Aug 5 | 0.088 | April 19 | 0.088 | April 20 |
2006 | 3 | 12 | 0.106 | Aug 1 | 0.104 | July 18 | 0.098 | Aug 2 | 0.082 | June 19 |
2007 | 2 | 13 | 0.093 | May 25 | 0.085 | June 26 | 0.082 | May 24 | 0.082 | July 25 |
2008 | 2 | 3 | 0.106 | June 10 | 0.086 | July 18 | 0.082 | July 19 | 0.075 | July 3 |
WALTHAMOperating from 1989 to 1999 |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 2 | 11 | 0.098 | Aug 9 | 0.091 | July 20 | 0.083 | Aug 4 | 0.082 | July 19 |
1995 | 5 | 16 | 0.107 | Aug 1 | 0.093 | June 30 | 0.090 | May 24 | 0.090 | Sept 7 |
1996 | 1 | 3 | 0.086 | Aug 7 | 0.080 | July 12 | 0.076 | June 7 | 0.074 | Aug 26 |
1997 | 6 | 11 | 0.106 | July 1 | 0.095 | June 21 | 0.093 | June 30 | 0.092 | Aug 11 |
1998 | 7 | 17 | 0.116 | Aug 24 | 0.100 | July 15 | 0.099 | July 14 | 0.098 | May 29 |
1999 | 5 | 13 | 0.104 | July 16 | 0.098 | June 24 | 0.091 | June 1 | 0.091 | July 17 |
WAREOperating from 1986 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 10 | 21 | 0.110 | July 20 | 0.109 | Aug 4 | 0.097 | Aug 25 | 0.095 | April 15 |
1995 | 7 | 13 | 0.110 | June 30 | 0.101 | July 13 | 0.097 | Aug 31 | 0.096 | Sept 7 |
1996 | 4 | 5 | 0.095 | Aug 7 | 0.093 | Aug 8 | 0.091 | July 8 | 0.085 | July 12 |
1997 | 9 | 22 | 0.119 | June 25 | 0.117 | July 1 | 0.115 | June 21 | 0.110 | Aug 11 |
1998 | 6 | 14 | 0.110 | May 29 | 0.102 | July 16 | 0.101 | July 14 | 0.093 | Aug 24 |
1999 | 9 | 13 | 0.106 | Aug 17 | 0.102 | June 1 | 0.094 | July 24 | 0.094 | July 31 |
2000 | 2 | 5 | 0.091 | June 10 | 0.089 | June 16 | 0.080 | July 3 | 0.076 | June 2 |
2001 | 12 | 23 | 0.119 | June 19 | 0.116 | June 20 | 0.099 | July 23 | 0.093 | May 4 |
2002 | 10 | 17 | 0.110 | Aug 14 | 0.107 | Aug 13 | 0.096 | Aug 11 | 0.095 | June 21 |
2003 | 0 | 3 | 0.084 | June 25 | 0.080 | June 29 | 0.077 | June 26 | 0.075 | July 2 |
2004 | 3 | 8 | 0.091 | Aug 10 | 0.090 | July 22 | 0.086 | Aug 3 | 0.083 | June 24 |
2005 | 8 | 12 | 0.101 | June 9 | 0.096 | June 8 | 0.091 | June 25 | 0.090 | July 26 |
2006 | 4 | 10 | 0.110 | June 19 | 0.103 | June 18 | 0.098 | June 22 | 0.086 | Aug 7 |
2007 | 7 | 15 | 0.113 | July 9 | 0.102 | Aug 3 | 0.093 | Aug 30 | 0.087 | Aug 29 |
2008 | 1 | 7 | 0.097 | June 10 | 0.082 | April 19 | 0.079 | July 8 | 0.079 | May 30 |
WORCESTEROperating from 1992 to Present |
---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
---|---|---|---|---|---|---|---|---|---|---|
0.084 | 0.075 | |||||||||
1994 | 11 | 20 | 0.107 | Aug 9 | 0.102 | Aug 4 | 0.098 | Aug 25 | 0.097 | July 7 |
1995 | 7 | 15 | 0.108 | Sept 7 | 0.106 | July 13 | 0.101 | Aug 31 | 0.096 | June 30 |
1996 | 0 | 2 | 0.080 | July 12 | 0.078 | Aug 7 | 0.074 | June 6 | 0.074 | June 7 |
1997 | 5 | 8 | 0.097 | July 1 | 0.095 | June 30 | 0.094 | Aug 11 | 0.092 | Aug 10 |
1998 | 6 | 14 | 0.123 | Aug 24 | 0.109 | July 15 | 0.103 | May 29 | 0.097 | July 14 |
1999 | 8 | 14 | 0.101 | June 24 | 0.098 | Aug 17 | 0.096 | July 16 | 0.093 | June 1 |
2000 | 1 | 4 | 0.095 | June 10 | 0.081 | July 13 | 0.077 | June 2 | 0.076 | Aug 9 |
2001 | 6 | 9 | 0.102 | June 19 | 0.097 | July 24 | 0.093 | July 23 | 0.091 | Aug 9 |
2002 | 8 | 14 | 0.118 | Aug 13 | 0.102 | Aug 12 | 0.097 | Sept 10 | 0.091 | Aug 11 |
2003 | 1 | 9 | 0.089 | June 27 | 0.084 | June 29 | 0.080 | June 25 | 0.080 | July 12 |
2004 | 0 | 3 | 0.082 | June 8 | 0.082 | July 22 | 0.076 | Aug 10 | 0.074 | June 24 |
2005 | 5 | 8 | 0.092 | June 25 | 0.090 | April 20 | 0.087 | June 24 | 0.085 | June 9 |
2006 | 2 | 5 | 0.091 | June 19 | 0.091 | June 22 | 0.083 | Aug 7 | 0.077 | May 25 |
2007 | 10 | 20 | 0.096 | June 27 | 0.095 | Aug 3 | 0.090 | June 25 | 0.089 | May 25 |
2008 | 2 | 8 | 0.104 | June 14 | 0.089 | July 3 | 0.084 | July 8 | 0.081 | June 10 |
Ground-level Ozone Home Page.Eight-hour Average Ozone Concentrations Page. |